| Macaulayite | (Fe,Al)₂₄Si₄O₄₃(OH)₂ | — | — | — |
| Macdonaldite | BaCa₄Si₁₆O₃₆(OH)₂·10H₂O | Orthorhombic | — | — |
| Macedonite | PbTiO₃ | Tetragonal | 5.5 | 7.80 g/cm³ |
| Macfallite | Ca₂Mn³⁺₃(SiO₄)(Si₂O₇)(OH)₃ | Monoclinic | — | — |
| Machatschkiite | Ca₆(AsO₄)(AsO₃OH)₃PO₄·15H₂O | — | — | — |
| Machiite | Al₂Ti₃O₉ | Monoclinic | — | — |
| Macivorite | (NH₄)₃Al₅(PO₃OH)₆(PO₄)₂·18H₂O | Trigonal | — | — |
| Mackayite | Fe³⁺Te⁴⁺₂O₅(OH) | — | — | — |
| Mackinawite | (Fe,Ni)₉S₈ | Tetragonal | 2.5 | 4.30 g/cm³ |
| Macphersonite | Pb₄(CO₃)₂(SO₄)(OH)₂ | Orthorhombic | — | — |
| Macquartite | Cu₂Pb₇(CrO₄)₄(SiO₄)₂(OH)₂ | Monoclinic | — | — |
| Macraeite | [K(H₂O)]Mn₂(Fe₂Ti)(PO₄)₄[O(OH)](H₂O)₁₀·4H₂O | Monoclinic | — | — |
| Madeiraite | — | Monoclinic | — | — |
| Madocite | Pb₁₈(Sb,As)₁₅S₄₁ | Orthorhombic | — | — |
| Magadiite | Na₂Si₁₄O₂₉·11H₂O | — | — | — |
| Magbasite | KBaFe³⁺Mg₇Si₈O₂₂(OH)₂F₆ | Orthorhombic | — | — |
| Magganasite | CuFe³⁺₃O(AsO₄)₃ | Triclinic | — | — |
| Maghagendorfite | (Na,☐)MgMn(Fe,Fe)₂(PO₄)₃ | — | — | — |
| Maghemite | (Fe³⁺₀.₆₇☐₀.₃₃)Fe³⁺₂O₄ | Cubic | 6.0 | — |
| Maghrebite | MgAl₂(AsO₄)₂(OH)₂·8H₂O | — | — | — |
| Magnanelliite | — | Monoclinic | — | — |
| Magnesio-arfvedsonite | NaNa₂(Mg₄Fe³⁺)Si₈O₂₂(OH)₂ | Monoclinic | — | — |
| Magnesio-dutrowite | Na(Mg₂.₅Ti₀.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃O | Trigonal | — | — |
| Magnesio-ferri-fluoro-hornblende | ☐Ca₂(Mg₄Fe³⁺)(Si₇Al)O₂₂F₂ | Monoclinic | — | — |
| Magnesio-ferri-hornblende | ☐Ca₂(Mg₄Fe³⁺)[(Si₇Al)O₂₂](OH)₂ | Monoclinic | — | — |
| Magnesio-fluoro-arfvedsonite | NaNa₂(Mg₄Fe³⁺)Si₈O₂₂F₂ | Monoclinic | 5.5 | — |
| Magnesio-fluoro-hastingsite | NaCa₂(Mg₄Fe³⁺)(Si₆Al₂)O₂₂F₂ | Monoclinic | — | — |
| Magnesio-fluoro-riebeckite | ◻Na₂(Mg₃Fe³⁺₂)(Si₈O₂₂)F₂ | Monoclinic | — | — |
| Magnesio-foitite | (☐,Na)(Mg₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH) | Trigonal | 7.0 | — |
| Magnesio-hastingsite | NaCa₂(Mg₄Fe³⁺)(Si₆Al₂)O₂₂(OH)₂ | Monoclinic | — | — |
| Magnesio-hornblende | ☐Ca₂(Mg₄Al)(Si₇Al)O₂₂(OH)₂ | Monoclinic | 5.5 | — |
| Magnesio-lucchesiite | CaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃O | Trigonal | — | — |
| Magnesio-riebeckite | ☐Na₂(Mg₃Fe³⁺₂)Si₈O₂₂(OH)₂ | Monoclinic | 6.0 | — |
| Magnesioalterite | Mg₂Fe³⁺₄(SO₄)₄(C₂O₄)₂(OH)₄·17H₂O | Monoclinic | — | — |
| Magnesioaubertite | (Mg,Cu)Al(SO₄)₂Cl * 14H₂O | — | — | — |
| Magnesiobeltrandoite-2N3S | (Mg₆Al₂)(Al₁₈(Fe³⁺)₂)O₃₈(OH)₂ | Trigonal | — | — |
| Magnesiobermanite | MgMn³⁺₂(PO₄)₂(OH)₂*₄H₂O | Monoclinic | — | — |
| Magnesiocanutite | NaMnMg₂[AsO₄]₂[AsO₂(OH)₂] | Monoclinic | — | — |
| Magnesiocarpholite | (Mg,Fe²⁺)Al₂(Si₂O₆)(OH)₄ | — | — | — |
| Magnesiochangesite-(Ce) | (Ca₈Ce)□Mg(PO₄)₇ | Trigonal | — | — |
| Magnesiochangesite-(Y) | (Ca₈Y)◻Mg(PO₄)₇ | Trigonal | — | — |
| Magnesiochloritoid | MgAl₂O(SiO₄)(OH)₂ | Monoclinic | — | — |
| Magnesiochlorophoenicite | (Mg,Mn)₃Zn₂(AsO₄)(OH,O)₆ | Monoclinic | — | — |
| Magnesiochromite | MgCr³⁺₂O₄ | Cubic | 5.5 | — |
| Magnesiocopiapite | MgFe³⁺₄(SO₄)₆(OH)₂ * 20H₂O | — | — | — |
| Magnesiocoulsonite | MgV₂O₄ | Cubic | — | — |
| Magnesiodumortierite | MgAl₆BSi₃O₁₇(OH) | — | — | — |
| Magnesioferrite | MgFe³⁺₂O₄ | Cubic | — | — |
| Magnesiofluckite | CaMg(AsO₃OH)₂(H₂O)₂ | Triclinic | — | — |
| Magnesiohatertite | (Na,Ca)₂Ca(Mg,Fe³⁺)₂(AsO₄)₃ | Monoclinic | — | — |
| Magnesiohongruiite-(Fe³⁺) | (Mg₂Fe³⁺)Fe³⁺NbO₇(OH) | Hexagonal | — | — |
| Magnesiohulsite | Mg₂Fe³⁺O₂(BO₃) | Monoclinic | — | — |
| Magnesiohögbomite-2N2S | — | Hexagonal | — | — |
| Magnesiohögbomite-2N3S | [(Mg,Fe²⁺,Zn)₄(Al,Ti,Fe³⁺)₁₀O₁₉(OH)]₂ | Trigonal | — | — |
| Magnesiohögbomite-2N4S | [(Mg₈.₄₃Fe²⁺₁.₅₇)Σ=₁₀Al₂₂Ti⁴⁺₂O₄₆(OH)₂] | Hexagonal | — | — |
| Magnesiohögbomite-6N12S | — | Trigonal | — | — |
| Magnesiohögbomite-6N6S | [(Mg,Fe²⁺)₃(Al,Ti,Fe³⁺)₈O₁₅(OH)]₆ | Trigonal | — | — |
| Magnesiokoritnigite | Mg(AsO₃OH)·H₂O | Triclinic | — | — |
| Magnesioleydetite | Mg(UO₂)(SO₄)₂·11H₂O | Monoclinic | — | — |
| Magnesioneptunite | KNa₂Li(Mg,Fe)₂Ti₂Si₈O₂₄ | Monoclinic | — | — |
| Magnesionigerite-2N1S | (Mg,Al,Zn)₂(Al,Sn)₆O₁₁(OH) | — | — | — |
| Magnesionigerite-6N6S | (Mg,Al,Zn)₃(Al,Sn,Fe)₈O₁₅(OH) | — | — | — |
| Magnesiopascoite | Ca₂Mg(V₁₀O₂₈)·16H₂O | Monoclinic | 2.5 | — |
| Magnesioqingheiite | Na₂Mg(MgAl)(PO₄)₃ | Monoclinic | — | — |
| Magnesiorowlandite-(Y) | Y₄(Mg,Fe)(Si₂O₇)₂F₂ | Triclinic | — | — |
| Magnesiostaurolite | Mg(Mg,Li)₃(Al,Mg)₁₈Si₈O₄₄(OH)₄ | — | — | — |
| Magnesiotaaffeite-2N'2S | Mg₃BeAl₈O₁₆ | Hexagonal | 8.0 | 3.60 g/cm³ |
| Magnesiotaaffeite-6N'3S | Mg₂BeAl₆O₁₂ | — | — | — |
| Magnesiovesuvianite | Ca₁₉Mg(Al₁₀Mg₂)(Si₂O₇)₄(SiO₄)₁₀(OH)₁₀ | Tetragonal | — | — |
| Magnesiovoltaite | K₂Mg₅Fe³⁺₃Al(SO₄)₁₂*₁₈H₂O | Cubic | — | — |
| Magnesiozippeite | Mg(UO₂)₂(SO₄)O₂ * 3.₅H₂O | Monoclinic | — | — |
| Magnesite | MgCO₃ | Trigonal | — | 2.96 g/cm³ |
| Magnetite | Fe²⁺Fe³⁺₂O₄ | Cubic | 6.0 | 5.17 g/cm³ |
| Magnetoplumbite | PbFe³⁺₁₂O₁₉ | — | — | — |
| Magnioursilite | Mg₄(UO₂)₄(Si₂O₅)₅(OH)₆·20H₂O | — | — | — |
| Magnolite | Hg¹⁺₂Te⁴⁺O₃ | — | — | — |
| Magnussonite | Mn₁₀As₆O₁₈(OH,Cl)₂ | — | — | — |
| Magnéliite | Ti³⁺₂Ti⁴⁺₂O₇ | Triclinic | — | — |
| Magselite | [Mg(H₂O)₆](Se⁴⁺O₃) | Trigonal | — | — |
| Mahnertite | NaCu₃(AsO₄)₂Cl * 5H₂O | Tetragonal | — | — |
| Maikainite | Cu₁₀Fe₃MoGe₃S₁₆ | — | 4.0 | 4.54 g/cm³ |
| Majakite | PdNiAs | Hexagonal | 6.0 | 9.33 g/cm³ |
| Majindeite | Mg₂Mo₃O₈ | Hexagonal | — | — |
| Majorite | Mg₃(Fe²⁺,Si,Al)₂(SiO₄)₃ | Cubic | 7.5 | — |
| Majzlanite | K₂Na(ZnNa)Ca(SO₄)₄ | Monoclinic | — | — |
| Makarochkinite | Ca₄[Fe²⁺₈Fe³⁺₂Ti₂]O₄[Si₈Be₂Al₂O₃₆] | Triclinic | — | — |
| Makatite | Na₂Si₄O₈(OH)₂ * 4H₂O | — | — | — |
| Makotoite | Ag₁₂(Cu₃Au)S₈ | — | — | — |
| Makovickyite | Cu₁.₁₂Ag₀.₈₁Pb₀.₂₇Bi₅.₃₅S₉ | Monoclinic | — | — |
| Malachite | Cu₂(CO₃)(OH)₂ | Monoclinic | 3.8 | 3.85 g/cm³ |
| Malanite | Cu(Pt³⁺,Ir³⁺)₂S₄ | Cubic | 5.0 | — |
| Malayaite | CaSn(SiO₄)O | Monoclinic | — | — |
| Maldonite | Au₂Bi | Cubic | — | — |
| Maleevite | BaB₂Si₂O₈ | Orthorhombic | — | 3.62 g/cm³ |
| Maletoyvayamite | Au₃Se₄Te₆ | Triclinic | — | — |
| Malhmoodite | FeZr(PO₄)₂ * 4H₂O | Monoclinic | 3.0 | — |
| Malinkoite | NaBSiO₄ | Hexagonal | 7.0 | 2.96 g/cm³ |
| Malladrite | Na₂[SiF₆] | Trigonal | — | — |
| Mallardite | Mn²⁺SO₄·7H₂O | Monoclinic | 2.0 | — |
| Mallestigite | Pb₃Sb₅+(SO₄)(AsO₄)(OH)₆ * 3H₂O | Hexagonal | 4.0 | 4.91 g/cm³ |
| Malyshevite | PdCuBiS₃ | Orthorhombic | — | — |
| Mambertiite | BiMo⁵⁺₂.₈O₈(OH) | Triclinic | — | — |
| Mammothite | Pb₆Cu₄AlSb₅+O₂(OH)₁₆Cl₄(SO₄)₂ | Monoclinic | — | — |
| Mampsisite | Ca₄Al₂(CO₃)(OH)₁₂·5H₂O | Triclinic | — | — |
| Manaevite-(Ce) | Ca₁₁(Ce,H₂O,Ca)₈Mg(Al,Fe)₄(Mg,Ti,Fe³⁺)₈[Si₂O₇]₄[(SiO₄)₈(H₄O₄)₂](OH)₉ | Tetragonal | — | — |
| Manaksite | KNaMn²⁺Si₄O₁₀ | — | — | — |
| Manandonite | Li₂Al₄(Si₂AlB)O₁₀(OH)₈ | Orthorhombic | 2.5 | — |
| Mandarinoite | Fe³⁺₂(Se⁴⁺O₃)₃·6H₂O | Monoclinic | 2.5 | — |
| Maneckiite | (Na☐)Ca₂Fe²⁺₂(Fe³⁺Mg)Mn₂(PO₄)₆·2H₂O | Orthorhombic | — | — |
| Manganarsite | Mn₃(As₂O₄)(OH)₄ | — | — | — |
| Manganbabingtonite | Ca₂(Mn,Fe)FeSi₅O₁₄(OH) | — | — | — |
| Manganbelyankinite | (Mn,Ca)(Ti,Nb)₅O₁₂ * 9H₂O | Amorphous | — | — |
| Manganberzeliite | (NaCa₂)Mn²⁺₂(AsO₄)₃ | Cubic | — | — |
| Manganflurlite | ZnMn²⁺₃Fe³⁺(PO₄)₃(OH)₂(H₂O)₇*₂H₂O | Monoclinic | — | — |
| Mangangordonite | Mn²⁺Al₂(PO₄)₂(OH)₂ * 8H₂O | — | — | — |
| Manganhumite | (Mn²⁺,Mg)₇(SiO₄)₃(OH)₂ | — | — | — |
| Mangani-dellaventuraite | NaNa₂(MgMn³⁺₂Ti⁴⁺Li)Si₈O₂₂O₂ | Monoclinic | — | — |
| Mangani-eckermannite | NaNa₂(Mg₄Mn³⁺)Si₈O₂₂(OH)₂ | Monoclinic | — | — |
| Mangani-obertiite | NaNa₂(Mg₃Mn³⁺Ti⁴⁺)Si₈O₂₂O₂ | Monoclinic | — | — |
| Mangani-pargasite | NaCa₂(Mg₄Mn³⁺)(Si₆Al₂)O₂₂(OH)₂ | Monoclinic | — | — |
| Manganiakasakaite-(La) | {CaLa}{Mn³⁺AlMn²⁺}(Si₂O₇)(SiO₄)O(OH) | Monoclinic | — | — |
| Manganiandrosite-(Ce) | MnCe(Mn³⁺AlMn²⁺)[Si₂O₇][SiO₄]O(OH) | Monoclinic | — | — |
| Manganiandrosite-(La) | {Mn²⁺La}{Mn³⁺AlMn²⁺}(Si₂O₇)(SiO₄)O(OH) | Monoclinic | — | — |
| Manganiceladonite | KMgMn³⁺Si₄O₁₀(OH)₂ | Monoclinic | — | — |
| Manganilvaite | CaFe²⁺Fe³⁺Mn²⁺(Si₂O₇)O(OH) | Monoclinic | — | — |
| Manganite | Mn³⁺O(OH) | Monoclinic | 4.0 | — |
| Manganlotharmeyerite | CaMn³⁺₂(AsO₄)₂(OH)₂ | — | 3.0 | — |
| Mangano-ferri-eckermannite | NaNa₂(Mn²⁺₄Fe³⁺)Si₈O₂₂(OH)₂ | Monoclinic | 5.0 | — |
| Mangano-mangani-ungarettiite | NaNa₂(Mn²⁺₂Mn³⁺₃)(Si₈O₂₂)O₂ | Monoclinic | — | — |
| Manganobadalovite | NaNaMn(MgFe³⁺)(AsO₄)₃ | Monoclinic | — | — |
| Manganoblödite | Na₂Mn(SO₄)₂·4H₂O | Monoclinic | — | — |
| Manganochromite | Mn²⁺Cr₂O₄ | Cubic | — | — |
| Manganoeudialyte | Na₁₄Ca₆Mn₃Zr₃[Si₂₆O₇₂(OH)₂](H₂O,Cl,O,OH)₆ | Trigonal | — | — |
| Manganohatertite | NaNaCa(MnFe³⁺)(AsO₄)₃ | Monoclinic | — | — |
| Manganohörnesite | Mn²⁺₃(AsO₄)₂·8H₂O | — | — | — |
| Manganokaskasite | (Mo,Nb)S₂·(Mn₁₋ₓAlₓ)(OH)₂₊ₓ | Trigonal | — | — |
| Manganokhomyakovite | Na₁₂Sr₃Ca₆Mn₃Zr₃W[Si₂₅O₇₃](O,OH,H₂O)₃(OH,Cl)₂ | Trigonal | — | — |
| Manganokukisvumite | Na₆MnTi₄(Si₈O₂₄)O₄ * 4H₂O | — | — | — |
| Manganolangbeinite | K₂Mn²⁺₂(SO₄)₃ | Cubic | — | — |
| Manganonaujakasite | Na₆(Mn²⁺,Fe²⁺)Al₄Si₈O₂₆ | Monoclinic | — | — |
| Manganoneptunite | Na₂KLiMn²⁺₂Ti₂Si₈O₂₄ | Monoclinic | — | — |
| Manganonewberyite | Mn(PO₃OH)(H₂O)₃ | Orthorhombic | — | — |
| Manganonordite-(Ce) | Na₃SrCeMn²⁺Si₆O₁₇ | — | — | — |
| Manganoquadratite | AgMnAsS₃ | Tetragonal | — | — |
| Manganoschafarzikite | MnSb₂O₄ | Tetragonal | — | 5.31 g/cm³ |
| Manganosegelerite | (Mn²⁺,Ca)(Mn²⁺,Fe²⁺,Mg)Fe³⁺(PO₄)₂(OH)·4H₂O | — | — | — |
| Manganosite | Mn²⁺O | Cubic | — | — |
| Manganostibite | Mn²⁺₇Sb⁵⁺As⁵⁺O₁₂ | Orthorhombic | — | — |
| Manganotychite | Na₆Mn²⁺₂(CO₃)₄(SO₄) | Cubic | — | — |
| Manganrockbridgeite | Mn²⁺₂Fe³⁺₃(PO₄)₃(OH)₄(H₂O) | Monoclinic | — | — |
| Manganvesuvianite | Ca₁₉Mn³⁺(Al,Mn³⁺,Fe³⁺)₁₀(Mg,Mn²⁺)₂(Si₂O₇)₄(SiO₄)₁₀O(OH)₉ | Tetragonal | — | 3.40 g/cm³ |
| Mangazeite | Al₂SO₄(OH)₄·3H₂O | Triclinic | — | — |
| Manitobaite | Na₁₆Mn²⁺₂₅Al₈(PO₄)₃₀ | Monoclinic | — | — |
| Manjiroite | Na(Mn⁴⁺₇Mn³⁺)O₁₆ | — | 4.0 | — |
| Mannardite | Ba(Ti₄+₆V³⁺₂)O₁₆ | — | — | — |
| Mansfieldite | AlAsO₄·2H₂O | — | — | — |
| Mantienneite | (H₂O)₂Mg₂(Al₂Ti)(PO₄)₄(OH)₂(H₂O)₁₀·4H₂O | Orthorhombic | — | — |
| Manuelarossiite | PbCaAlF₇ | Monoclinic | — | — |
| Maohokite | MgFe₂O₄ | Orthorhombic | — | 4.42 g/cm³ |
| Maoniupingite-(Ce) | (Ce,Ca)₄(Fe³⁺,Ti,Fe²⁺,☐)(Ti,Fe³⁺,Fe²⁺,Nb)₄Si₄O₂₂ | Monoclinic | — | — |
| Mapimite | Zn₂Fe³⁺₃(AsO₄)₃(OH)₄·10H₂O | Monoclinic | — | — |
| Mapiquiroite | (Sr,Pb)(U,Y)Fe₂(Ti,Fe³⁺)₁₈O₃₈ | Trigonal | — | — |
| Marathonite | Pd₂₅Ge₉ | Trigonal | — | — |
| Marcasite | FeS₂ | Orthorhombic | — | 4.94 g/cm³ |
| Marchettiite | C₅H₇N₅O₃ | Triclinic | — | — |
| Marcobaldiite | Pb₁₂(Sb₃As₂Bi)∑₆S₂₁ | Triclinic | — | — |
| Margaritasite | Cs₂(UO₂)₂(VO₄)₂·H₂O | Monoclinic | — | — |
| Margarite | CaAl₂(Si₂Al₂)O₁₀(OH)₂ | Monoclinic | — | — |
| Margarosanite | Pb(Ca,Mn²⁺)₂(Si₃O₉) | — | — | — |
| Mariakrite | — | Triclinic | — | — |
| Marialite | Na₄Al₃Si₉O₂₄Cl | Tetragonal | — | — |
| Marianoite | Na₂Ca₄(Nb,Zr)₂(Si₂O₇)₂(O,F)₄ | — | — | — |
| Maricopaite | Ca₂Pb₇(Si₃₆Al₁₂)O₉₉·n(H₂O,OH) | Orthorhombic | — | — |
| Mariinskite | BeCr₂O₄ | Orthorhombic | 8.5 | 4.62 g/cm³ |
| Marinaite | Cu₂Fe³⁺O₂(BO₃) | Monoclinic | — | — |
| Marinellite | (Na,K)₄₂Ca₆(Al₆Si₆O₂₄)₆(SO₄)₈Cl₂ * 3H₂O | Trigonal | — | — |
| Marioantofilliite | [Cu₄Al₂(OH)₁₂](CO₃)·3H₂O | Monoclinic | — | — |
| Marićite | — | Orthorhombic | — | — |
| Markascherite | Cu₃(MoO₄)(OH)₄ | Monoclinic | — | — |
| Markcooperite | Pb₂(UO₂)TeO₆ | Monoclinic | — | 8.09 g/cm³ |
| Markeyite | Ca₉(UO₂)₄(CO₃)₁₃·28H₂O | Orthorhombic | — | — |
| Markhininite | TlBi(SO₄)₂ | Triclinic | — | — |
| Marklite | Cu₅(CO₃)₂(OH)₆ * 6H₂O | Monoclinic | — | — |
| Markwelchite | TlPbSbS₃ | Monoclinic | — | — |
| Marokite | CaMn³⁺₂O₄ | Orthorhombic | — | — |
| Marrite | AgPbAsS₃ | Monoclinic | — | 5.49 g/cm³ |
| Marrucciite | Hg₃Pb₁₆Sb₁₈S₄₆ | Monoclinic | — | — |
| Marsaalamite-(Y) | Y(MoO₄)(OH) | Monoclinic | — | — |
| Marshite | CuI | Cubic | 2.5 | — |
| Marsturite | NaCaMn₃Si₅O₁₄(OH) | — | — | — |
| Marthozite | Cu²⁺(UO₂)₃(SeO₃)₂O₂ * 8H₂O | — | 6.0 | 4.44 g/cm³ |
| Martinandresite | Ba₂(Al₄Si₁₂O₃₂)·10H₂O | Orthorhombic | — | — |
| Martinite | (Na,☐,Ca)₁₂Ca₄(Si,S,B)₁₄B₂O₃₈(OH,Cl)₂F₂·4H₂O | Triclinic | 4.0 | — |
| Martyite | Zn₃V₂O₇(OH)₂·2H₂O | Trigonal | — | — |
| Marumoite | Pb₃₂As₄₀S₉₂ | — | — | — |
| Maruyamaite | K(MgAl₂)(Al₅Mg)(BO₃)₃(Si₆O₁₈)(OH)₃O | Trigonal | 7.0 | — |
| Marécottite | — | Triclinic | — | — |
| Masaitisite | KCu₅O₂(SeO₃)₂Cl₃ | Orthorhombic | — | — |
| Mascagnite | (NH₄)₂SO₄ | Orthorhombic | — | — |
| Maslovite | PtBiTe | Cubic | — | 11.63 g/cm³ |
| Massicot | PbO | Orthorhombic | — | 8.81 g/cm³ |
| Masutomilite | (K,Rb)(Li,Mn³⁺,Al)₃(AlSi₃O₁₀)(F,OH)₂ | Monoclinic | — | — |
| Masuyite | Pb(UO₂)₃O₃(OH)₂ * 3H₂O | Orthorhombic | — | 5.08 g/cm³ |
| Mathesiusite | K₅(UO₂)₄(SO₄)₄(VO₅)(H₂O)₄ | Tetragonal | 2.0 | — |
| Mathewrogersite | Pb₇FeAl₃GeSi₁₂O₃₆(OH,H₂O)₆ | Hexagonal | 2.0 | — |
| Mathiasite | (K, Ba, Sr)(Zr, Fe)(Mg,Fe)₂ (Ti,Cr,Fe)₁₈O₃₈ | Trigonal | — | — |
| Matildite | AgBiS₂ | Trigonal | 2.5 | — |
| Matioliite | NaMgAl₅(PO₄)₄(OH)₆·2H₂O | — | — | — |
| Matlockite | PbClF | Tetragonal | — | — |
| Matsubaraite | Sr₄Ti₅(Si₂O₇)₂O₈ | Monoclinic | — | — |
| Mattagamite | CoTe₂ | Orthorhombic | — | 7.79 g/cm³ |
| Matteuccite | NaHSO₄ * H₂O | Monoclinic | — | — |
| Mattheddleite | Pb₅(SiO₄)₁.₅(SO₄)₁.₅(Cl,OH) | — | — | — |
| Matthiasweilite | PbTe⁴⁺O₃ | Triclinic | — | — |
| Matulaite | (Fe³⁺,Al)Al₇(PO₄)₄(PO₃OH)₂(OH)₈(H₂O)₈ * 8H₂O | — | — | — |
| Matyhite | Ca₁₈(Ca,☐)₂Fe²⁺₂(PO₄)₁₄ | Trigonal | — | — |
| Maucherite | Ni₁₁As₈ | Tetragonal | 5.0 | — |
| Mauriziodiniite | (NH₄)(As₂O₃)₂I | Hexagonal | 1.0 | — |
| Maurogemmiite | Ti₁₀Fe₃O₃ | Hexagonal | — | — |
| Mavlyanovite | Mn₅Si₃ | Hexagonal | — | — |
| Mawbyite | Pb(Fe₁.₅,Zn₀.₅)(AsO₄)₂(OH)₁.₅(H₂O)₀.₅ | Monoclinic | 4.0 | 5.37 g/cm³ |
| Mawsonite | Cu₆Fe₂SnS₈ | Tetragonal | — | — |
| Maxwellite | NaFe³⁺(AsO₄)F | — | — | — |
| Mayingite | IrBiTe | Cubic | — | — |
| Mazzettiite | Ag₃HgPbSbTe₅ | — | — | — |
| Mazzite-Mg | Mg₅(Si₂₆Al₁₀)O₇₂·30H₂O | Hexagonal | — | — |
| Mazzite-Na | Na₈(Si₂₈Al₈)O₇₂·30H₂O | Hexagonal | — | — |
| Mbobomkulite | (Ni,Cu)Al₄((NO₃)₂,SO₄)(OH)₁₂ * 3H₂O | Monoclinic | — | — |
| Mcallisterite | Mg₂[B₆O₇(OH)₆]₂ * 9H₂O | Trigonal | — | — |
| Mcalpineite | Cu₃(Te⁶⁺O₆) | Cubic | — | — |
| Mcauslanite | Fe₃Al₂(PO₄)₃(PO₃OH)F * 18H₂O | Triclinic | — | — |
| Mcbirneyite | Cu₃(VO₄)₂ | Triclinic | — | — |
| Mcconnellite | CuCrO₂ | Trigonal | — | 5.60 g/cm³ |
| Mccrillisite | NaCs(Be,Li)Zr₂(PO₄)₄·1-2H₂O | — | — | — |
| Mcgillite | (Mn,Fe)₈Si₆O₁₅(OH)₈Cl₂ | — | — | — |
| Mcgovernite | Mn₁₉Zn₃(AsO₄)₃(AsO₃)(SiO₄)₃(OH)₂₁ | — | — | — |
| Mcguinnessite | CuMgCO₃(OH)₂ | Monoclinic | 2.5 | — |
| Mckelveyite-(Nd) | NaCaBa₃Nd(CO₃)₆·3H₂O | Monoclinic | — | — |
| Mckelveyite-(Y) | NaBa₃(Ca,U)Y(CO₃)₆·3H₂O | Triclinic | — | — |
| Mckinstryite | Ag₅Cu₃S₄ | Orthorhombic | — | — |
| Mcnearite | NaCa₅(AsO₄)(HAsO₄)₄ * 4H₂O | Triclinic | — | — |
| Medaite | Mn²⁺₆V₅+Si₅O₁₈(OH) | Monoclinic | — | — |
| Medenbachite | Bi₂Fe³⁺Cu²⁺(AsO₄)₂O(OH)₃ | — | — | — |
| Medvedevite | — | Monoclinic | — | — |
| Meerschautite | (Ag,Cu)₆Pb₄₃-₂ₓSb₄₄₊₂ₓS₁₁₂Oₓ (x~0.5) | Monoclinic | — | — |
| Megacyclite | Na₈KSi₉O₁₈(OH)₉ * 19H₂O | Monoclinic | — | — |
| Megakalsilite | KAlSiO₄ | Hexagonal | — | 2.54 g/cm³ |
| Megawite | CaSnO₃ | Orthorhombic | — | 5.52 g/cm³ |
| Meieranite | Na₂Sr₃MgSi₆O₁₇ | Orthorhombic | — | — |
| Meierite | Ba₄₄Si₆₆Al₃₀O₁₉₂Cl₂₅(OH)₃₃ | Cubic | — | — |
| Meionite | (Ca,Na)₄(Si,Al)₁₂O₂₄(CO₃,SO₄,Cl) | — | — | — |
| Meisserite | Na₅(UO₂)(SO₄)₃(SO₃OH)(H₂O) | Triclinic | — | — |
| Meitnerite | (NH₄)(UO₂)(SO₄)(OH)*₂H₂O | Triclinic | — | — |
| Meixnerite | Mg₆Al₂(OH)₁₆(OH)₂ * 4H₂O | — | — | — |
| Meizhouite | Fe²⁺V³⁺₂(PO₄)₂(OH)₂ | Monoclinic | — | — |
| Mejillonesite | HNaMg₂(HPO₄)(PO₄)(OH)·2H₂O | Orthorhombic | 4.0 | — |
| Melanarsite | K₃Cu₇Fe³⁺O₄(AsO₄)₄ | Monoclinic | — | — |
| Melanocerite-(Ce) | Ce₅(SiO₄,BO₄)₃(OH,O) | — | — | — |
| Melanophlogite | ₄₆SiO₂ * 6(N₂,CO₂) * 2(CH₄,N₂) | Tetragonal | — | — |
| Melanostibite | Mn²⁺(Sb⁵⁺,Fe³⁺)O₃ | Trigonal | — | — |
| Melanotekite | Pb₂Fe³⁺₂(Si₂O₇)O₂ | Orthorhombic | — | — |
| Melanothallite | Cu₂OCl₂ | Orthorhombic | — | — |
| Melanovanadite | Ca(V⁵⁺,V⁴⁺)₄O₁₀·5H₂O | Triclinic | 2.5 | — |
| Melansonite | — | Orthorhombic | — | — |
| Melanterite | Fe²⁺SO₄·7H₂O | Monoclinic | 2.0 | — |
| Melcherite | Ba₂Na₂Mg[Nb₆O₁₉]·6H₂O | Trigonal | — | — |
| Meliphanite | (Ca,Na)₂(Be,Al)[Si₂O₆(OH,F)] | Tetragonal | — | — |
| Melkovite | [Ca₂(H₂O)₁₅Ca(H₂O)₆][Mo₈P₂Fe³⁺₃O₃₆(OH)] | — | — | — |
| Melliniite | (Ni,Fe)₄P | Cubic | — | — |
| Mellite | Al₂[C₆(COO)₆] * 16H₂O | Tetragonal | — | — |
| Mellizinkalite | K₃Zn₂Cl₇ | Triclinic | — | — |
| Melonite | NiTe₂ | Trigonal | — | 7.50 g/cm³ |
| Menchettiite | Pb₅Mn₃Ag₂Sb₆As₄S₂₄ | Monoclinic | — | — |
| Mendeleevite-(Ce) | Cs₆(REE₂₂Ca₆)(Si₇₀O₁₇₅)(OH,F)₁₄(H₂O)₂₁ | Cubic | — | — |
| Mendeleevite-(Nd) | Cs₆[(Nd,REE)₂₃Ca₇](Si₇₀O₁₇₅)(OH,F)₁₉(H₂O)₁₆ | Cubic | — | — |
| Mendigite | Mn₂Mn₂MnCa(Si₃O₉)₂ | Triclinic | — | — |
| Mendipite | Pb₃O₂Cl₂ | Orthorhombic | — | — |
| Mendozavilite-KCa | [K₂(H₂O)₁₅Ca(H₂O)₆][Mo₈P₂Fe³⁺₃O₃₄(OH)₃] | Monoclinic | — | — |
| Mendozavilite-NaCu | [Na₂(H₂O)₁₅Cu(H₂O)₆][Mo₈P₂Fe³⁺₃O₃₄(OH)₃] | Monoclinic | — | — |
| Mendozavilite-NaFe | [Na₂(H₂O)₁₅Fe³⁺(H₂O)₆][Mo₈P₂Fe³⁺₃O₃₅(OH)₂] | Monoclinic | — | — |
| Mendozite | NaAl(SO₄)₂·11H₂O | — | — | — |
| Meneghinite | Pb₁₃CuSb₇S₂₄ | Orthorhombic | 2.5 | — |
| Menezesite | Ba₂MgZr₄(BaNb₁₂O₄₂) * ₁₂H₂O | Cubic | — | — |
| Mengeite | Ba(Mg,Mn²⁺)Mn³⁺₄(PO₄)₄(OH)₄*₄H₂O | Triclinic | — | — |
| Mengxianminite | (Ca,Na)₂Sn₂(Mg,Fe)₃Al₈[(BO₃)(BeO₄)O₆]₂ | Orthorhombic | — | — |
| Meniaylovite | Ca₄AlSi(SO₄)F₁₃·12H₂O | Cubic | — | — |
| Menshikovite | Pd₃Ni₂As₃ | Hexagonal | 5.0 | — |
| Menzerite-(Y) | (CaY₂)Mg₂(SiO₄)₃ | Cubic | — | — |
| Mercallite | KHSO₄ | Orthorhombic | — | 2.37 g/cm³ |
| Mercury (native) | Hg | Trigonal | — | 13.60 g/cm³ |
| Mereheadite | Pb₄₇Cl₂₅(OH)₁₃O₂₄(CO₃)(BO₃)₂ | Monoclinic | 3.5 | — |
| Mereiterite | K₂Fe(SO₄)₂ * 4H₂O | — | — | — |
| Merelaniite | Pb₄Mo₄VSbS₁₅ | Triclinic | — | — |
| Merenskyite | PdTe₂ | Trigonal | — | 8.00 g/cm³ |
| Meridianiite | MgSO₄·11H₂O | Triclinic | — | — |
| Merlinoite | K₅Ca₂(Si₂₃Al₉)O₆₄·24H₂O | Orthorhombic | 4.5 | — |
| Merrihueite | (K,Na)₂(Fe²⁺,Mg)₅[Si₁₂O₃₀] | Hexagonal | — | — |
| Merrillite | Ca₉NaMg(PO₄)₇ | Trigonal | — | 3.03 g/cm³ |
| Mertieite | Pd₈Sb₂.₅As₀.₅ | Trigonal | — | — |
| Merwinite | Ca₃Mg(SiO₄)₂ | Monoclinic | — | — |
| Mesaite | CaMn²⁺₅(V₂O₇)₃·12H₂O | Monoclinic | — | — |
| Mesolite | Na₂Ca₂(Si₉Al₆)O₃₀·8H₂O | Orthorhombic | 5.0 | — |
| Messelite | Ca₂Fe²⁺(PO₄)₂·2H₂O | Triclinic | 3.5 | — |
| Meta-aluminite | Al₂(SO₄)(OH)₄ * 5H₂O | — | — | — |
| Meta-alunogen | Al₂(SO₄)₃·14H₂O | Orthorhombic | — | — |
| Meta-ankoleite | K₂(UO₂)₂(PO₄)₂ * 6H₂O | — | — | 3.54 g/cm³ |
| Meta-autunite | Ca(UO₂)₂(PO₄)₂·6H₂O | Tetragonal | — | — |
| Metaborite | HBO₂ | Cubic | — | 2.10 g/cm³ |
| Metacalciouranoite | (Ca,Na,Ba)U₂O₇·2H₂O | — | — | — |
| Metacinnabar | HgS | Cubic | 3.0 | 7.38 g/cm³ |
| Metadelrioite | SrCa(VO₃)₂(OH)₂ | Triclinic | — | — |
| Metahaiweeite | Ca(UO₂)₂Si₆O₁₅ * nH₂O | — | — | — |
| Metaheimite | PbCu₂(AsO₄)(OH)₃ | Monoclinic | — | — |
| Metaheinrichite | Ba(UO₂)₂(AsO₄)₂ * 8H₂O | — | 2.5 | — |
| Metahewettite | CaV⁵⁺₆O₁₆·3H₂O | Monoclinic | — | — |
| Metahohmannite | Fe³⁺₂(SO₄)₂O * 4H₂O | — | — | — |
| Metakahlerite | Fe²⁺(UO₂)₂(AsO₄)₂ * 8H₂O | — | — | — |
| Metakirchheimerite | Co(UO₂)₂(AsO₄)₂·8H₂O | — | — | — |
| Metaköttigite | — | — | — | — |
| Metamunirite | NaVO₃ | Orthorhombic | — | 2.93 g/cm³ |
| Metanatroautunite | Na(UO₂)(PO₄)·3H₂O | — | — | — |
| Metarauchite | Ni(UO₂)₂(AsO₄)₂·8H₂O | Triclinic | 2.0 | — |
| Metarossite | CaV⁵⁺₂O₆·2H₂O | Triclinic | — | — |
| Metasaléeite | Mg(UO₂)₂(PO₄)₂·8H₂O | — | — | — |
| Metaschoderite | Al₂(PO₄)(VO₄) * 6H₂O | — | — | — |
| Metaschoepite | (UO₂)₈O₂(OH)₁₂ * 10H₂O | — | — | — |
| Metasideronatrite | Na₂Fe(SO₄)₂(OH) * H₂O | Orthorhombic | — | — |
| Metastibnite | Sb₂S₃ | Amorphous | — | — |
| Metastudtite | UO₄ * 2H₂O | — | — | — |
| Metaswitzerite | Mn²⁺₃(PO₄)₂ * 4H₂O | Monoclinic | — | — |
| Metatamboite | Fe³⁺₃(OH)(H₂O)₂(SO₄)(Te₄+O₃)₃(Te₄+O(OH)₂)(H₂O) | Monoclinic | — | — |
| Metathénardite | — | Hexagonal | — | — |
| Metatorbernite | Cu(UO₂)₂(PO₄)₂·8H₂O | Tetragonal | — | — |
| Metatyuyamunite | Ca(UO₂)₂(VO₄)₂·3H₂O | Monoclinic | — | — |
| Metauramphite | (NH₄)₂(UO₂)₂(PO₄)₂·6H₂O | — | — | — |
| Metauranocircite | Ba(UO₂)₂(PO₄)₂·6H₂O | — | — | — |
| Metauranocircite II | Ba(UO₂)₂(PO₄)₂·6H₂O | — | — | — |
| Metauranopilite | (UO₂)₆(SO₄)(OH)₁₀ * 5H₂O | Orthorhombic | — | — |
| Metauranospinite | Ca(UO₂)₂(AsO₄)₂ * 8H₂O | — | — | — |
| Metauroxite | — | — | — | — |
| Metavandendriesscheite | PbU₇O₂₂ * nH₂O n < ₁₂ | — | — | — |
| Metavanmeersscheite | U₆+(UO₂)₃(PO₄)₂(OH)₆ * 2H₂O | — | — | — |
| Metavanuralite | Al(UO₂)₂(VO₄)₂(OH)·8H₂O | Triclinic | — | — |
| Metavariscite | AlPO₄·2H₂O | Monoclinic | 3.5 | — |
| Metavauxite | Fe²⁺Al₂(PO₄)₂(OH)₂ * 8H₂O | Monoclinic | 3.0 | 2.35 g/cm³ |
| Metavivianite | Fe²⁺Fe³⁺₂(PO₄)₂(OH)₂ * 6H₂O | — | — | — |
| Metavoltine | Na₆K₂FeFe₆(SO₄)₁₂O₂·18H₂O | Trigonal | — | — |
| Metazellerite | Ca(UO₂)(CO₃)₂ * 3H₂O | Orthorhombic | — | — |
| Metazeunerite | Cu(UO₂)₂(AsO₄)₂·8H₂O | Tetragonal | — | — |
| Meurigite-K | KFe³⁺₈(PO₄)₆(OH)₇ * 6.₅H₂O | Monoclinic | — | — |
| Meurigite-Na | [Na(H₂O)₂.₅][Fe³⁺₈(PO₄)₆(OH)₇(H₂O)₄] | Monoclinic | — | — |
| Meyerhofferite | CaB₃O₃(OH)₅·H₂O | Triclinic | — | — |
| Meymacite | WO₃ * 2H₂O | Amorphous | — | — |
| Meyrowitzite | Ca(UO₂)(CO₃)₂·5H₂O | Monoclinic | — | — |
| Mgriite | Cu₃AsSe₃ | Cubic | — | — |
| Mianningite | (☐,Pb,Ce,Na)(U⁴⁺,Mn,U⁶⁺)Fe³⁺₂(Ti,Fe³⁺)₁₈O₃₈ | Trigonal | — | — |
| Miargyrite | AgSbS₂ | Monoclinic | 2.5 | 5.04 g/cm³ |
| Miassite | Rh₁₇S₁₅ | Cubic | — | 7.53 g/cm³ |
| Michalskiite | — | Orthorhombic | — | — |
| Micheelsenite | (Ca,Y)₃Al(HPO₄,CO₃)(CO₃)(OH)₆ * 12H₂O | Hexagonal | — | — |
| Michenerite | PdBiTe | Cubic | — | 9.68 g/cm³ |
| Michitoshiite-(Cu) | — | Cubic | — | — |
| Microcline | KAlSi₃O₈ | Triclinic | 6.0 | 2.46 g/cm³ |
| Microsommite | Na₄K₂Ca₂(SO₄)(Si₆Al₆O₂₄)Cl₂ | Hexagonal | — | — |
| Midbarite | Ca₃Mg₂(V₂Si)O₁₂ | Cubic | — | — |
| Middendorfite | K₃Na₂Mn₅Si₁₂(O,OH)₃₆·2H₂O | Monoclinic | — | — |
| Middlebackite | Cu₂C₂O₄(OH)₂ | Monoclinic | — | — |
| Mieite-(Y) | Y₄Ti(SiO₄)₂O[F,(OH)]₆ | Orthorhombic | — | — |
| Miersite | (Ag,Cu)I | Cubic | — | — |
| Miessiite | Pd₁₁Te₂Se₂ | Cubic | — | — |
| Miguelromeroite | MnMn₂Mn₂(AsO₄)₂(HAsO₄)₂ * 4H₂O | Monoclinic | — | — |
| Miharaite | PbCu₄FeBiS₆ | Orthorhombic | — | — |
| Mikasaite | Fe₂(SO₄)₃ | Trigonal | — | 3.04 g/cm³ |
| Mikecoxite | [CHg₄]OCl₂ | Monoclinic | — | — |
| Mikenewite | Mn²⁺(S⁴⁺O₃)·3H₂O | Monoclinic | — | — |
| Milanriederite | Ca₁₉Fe³⁺Al₄(Mg₄Al₄)Si₁₈O₆₇(OH)₁₁ | — | — | — |
| Milarite | KCa₂(Be₂AlSi₁₂O₃₀)·nH₂O | Hexagonal | 6.0 | 2.60 g/cm³ |
| Millerite | NiS | Trigonal | 3.5 | 5.37 g/cm³ |
| Millisite | NaCaAl₆(PO₄)₄(OH)₉·3H₂O | — | — | — |
| Millosevichite | Al₂(SO₄)₃ | Triclinic | — | 2.86 g/cm³ |
| Millsite | Cu²⁺(Te₄+O₃)·2H₂O | Monoclinic | — | — |
| Milotaite | PdSbSe | Cubic | 4.5 | 8.09 g/cm³ |
| Mimetite | Pb₅(AsO₄)₃Cl | Hexagonal | — | 6.86 g/cm³ |
| Minakawaite | RhSb | Orthorhombic | — | 10.04 g/cm³ |
| Minasgeraisite-(Y) | CaY₂Be₂Si₂O₁₀ | — | — | — |
| Minasragrite | (V₄+O)(SO₄) * 5H₂O | — | — | — |
| Mineevite-(Y) | Na₂₅Ba(Y,Gd,Dy)₂(CO₃)₁₁(HCO₃)₄(SO₄)₂F₂Cl | Hexagonal | — | — |
| Minehillite | (K,Na)₂-₃Ca₂₈Zn₄Al₄Si₄₀O₁₁₂(OH)₁₆ | — | — | — |
| Minguzzite | K₃Fe³⁺(C₂O₄)₃·3H₂O | Monoclinic | — | 2.11 g/cm³ |
| Minium | Pb²⁺₂Pb⁴⁺O₄ | Tetragonal | — | — |
| Minjiangite | Ba[Be₂P₂O₈] | Hexagonal | — | — |
| Minnesotaite | Fe²⁺₃Si₄O₁₀(OH)₂ | Triclinic | — | — |
| Minohlite | (Cu,Zn)₇(SO₄)₂(OH)₁₀·8H₂O | Hexagonal | — | — |
| Minrecordite | CaZn(CO₃)₂ | Trigonal | 3.5 | — |
| Minyulite | KAl₂(PO₄)₂F·4H₂O | Orthorhombic | 3.5 | — |
| Mirabilite | Na₂SO₄·10H₂O | Monoclinic | — | — |
| Mirnyite | — | Trigonal | — | — |
| Misakiite | Cu₃Mn(OH)₆Cl₂ | Trigonal | — | — |
| Misenite | K₈H₆(SO₄)₇ | Monoclinic | — | — |
| Miserite | K₁.₅-x(Ca,Y,REE)₅(Si₆O₁₅)(Si₂O₇)(OH,F)₂ * yH₂O | — | — | — |
| Mitridatite | Ca₂Fe³⁺₃O₂(PO₄)₃(H₂O)₂·H₂O | Monoclinic | — | — |
| Mitrofanovite | Pt₃Te₄ | Trigonal | — | 10.64 g/cm³ |
| Mitryaevaite | Al₆(PO₄)((P,S)O₃(OH,O))₂F₂(OH)₂ * 14.₅H₂O | Triclinic | — | — |
| Mitscherlichite | K₂CuCl₄·2H₂O | — | — | — |
| Mixite | BiCu₆(AsO₄)₃(OH)₆ * 3H₂O | Hexagonal | — | — |
| Miyahisaite | (Sr,Ca)₂Ba₃(PO₄)₃F | Hexagonal | — | — |
| Miyawakiite-(Y) | ◻Y₄Fe₂(Si₈O₂₀)(CO₃)·4(H₂O)₃ | Tetragonal | — | — |
| Moabite | NiFe³⁺(PO₄)O | Orthorhombic | — | — |
| Moctezumite | Pb(UO₂)(TeO₃)₂ | Monoclinic | 3.0 | 7.28 g/cm³ |
| Modderite | (Co,Fe)As | Orthorhombic | 4.0 | — |
| Modraite | Ca₁₉Fe²⁺(Al₁₁Fe²⁺)(SiO₄)₁₀(Si₂O₇)₄O(OH)₉ | Tetragonal | — | — |
| Mogovidite | Na₉(Ca,Na)₁₂Fe₂Zr₃Si₂₅O₇₂(CO₃) (OH)₄ | Trigonal | — | — |
| Mogánite | SiO₂·nH₂O | Monoclinic | — | — |
| Mohite | Cu₂SnS₃ | Monoclinic | — | — |
| Mohrite | (NH₄)₂Fe²⁺(SO₄)₂·6H₂O | — | — | — |
| Moiraite | Pb₁₂Sb₈As₈S₃₆ | Triclinic | — | — |
| Moissanite | SiC | Hexagonal | 9.2 | 3.23 g/cm³ |
| Mojaveite | Cu₆[Te⁶⁺O₄(OH)₂](OH)₇Cl | Trigonal | — | — |
| Molinelloite | Cu(H₂O)(OH)V₄+O(V₅+O₄) | Triclinic | — | — |
| Moluranite | H₄U₄+(UO₂)₃(MoO₄)₇ * 18H₂O | — | — | — |
| Molybdenite | MoS₂ | Hexagonal | — | 4.67 g/cm³ |
| Molybdite | MoO₃ | Orthorhombic | — | — |
| Molybdofornacite | CuPb₂MoO₄AsO₄(OH) | Monoclinic | — | 6.60 g/cm³ |
| Molybdomenite | PbSe⁴⁺O₃ | — | — | — |
| Molybdophyllite | Pb₈Mg₉[Si₁₀O₂₈(OH)₈|O₂|(CO₃)₃] * H₂O | Monoclinic | — | — |
| Molysite | FeCl₃ | Hexagonal | — | — |
| Momoiite | (Mn²⁺,Ca)₃V³⁺₂(SiO₄)₃ | Cubic | 6.5 | — |
| Monazite-(Ce) | CePO₄ | Monoclinic | — | 5.19 g/cm³ |
| Monazite-(Gd) | Gd(PO₄) | Monoclinic | — | 5.55 g/cm³ |
| Monazite-(La) | LaPO₄ | Monoclinic | — | 5.07 g/cm³ |
| Monazite-(Nd) | NdPO₄ | Monoclinic | — | 5.42 g/cm³ |
| Monazite-(Sm) | SmPO₄ | Monoclinic | — | — |
| Moncheite | (Pt,Pd)(Te,Bi)₂ | — | 3.5 | — |
| Monchetundraite | — | Orthorhombic | — | — |
| Monetite | Ca(HPO₄) | Triclinic | — | 2.95 g/cm³ |
| Mongolite | Ca₄Nb₆Si₅O₂₄(OH)₁₀·6H₂O | Tetragonal | — | — |
| Monimolite | Pb₂Sb⁵⁺2O₇ | — | — | — |
| Monipite | MoNiP | Hexagonal | — | 8.47 g/cm³ |
| Monohydrocalcite | CaCO₃ * H₂O | Trigonal | — | — |
| Montanite | Bi³⁺₂Te⁶⁺O₆·nH₂O (0 < n < 2/3) | — | — | — |
| Montbrayite | (Au,Ag,Sb,Bi,Pb)₂₃(Te,Sb,Bi,Pb)₃₈ | — | — | — |
| Montdorite | (K,Na)₂(Fe²⁺,Mn²⁺,Mg)₅(Si₄O₁₀)₂(OH,F)₄ | — | — | — |
| Montebrasite | LiAlPO₄(OH) | Triclinic | — | — |
| Monteneroite | — | Monoclinic | — | — |
| Monteneveite | Ca₃Sb₅+₂(Fe³⁺₂Fe²⁺)O₁₂ | Cubic | — | — |
| Monteponite | CdO | Cubic | 3.0 | 8.10 g/cm³ |
| Monteregianite-(Y) | KNa₂YSi₈O₁₉·5H₂O | — | — | — |
| Montesommaite | K₉(Si₂₃Al₉)O₆₄·10H₂O | Orthorhombic | — | — |
| Montetrisaite | Cu₆(SO₄)(OH)₁₀·2H₂O | Orthorhombic | — | — |
| Montgomeryite | Ca₄MgAl₄(PO₄)₆(OH)₄ * 12H₂O | Monoclinic | — | — |
| Monticellite | CaMgSiO₄ | Orthorhombic | — | 2.96 g/cm³ |
| Montmorillonite | (Na,Ca)₀.₃₃(Al,Mg)₂(Si₄O₁₀)(OH)₂ * nH₂O | Monoclinic | 1.3 | 1.80 g/cm³ |
| Montpelvouxite | AgPb₁₆Sb₂₇As₁₈S₈₄ | Triclinic | — | — |
| Montroseite | (V³⁺,Fe²⁺,V⁴⁺)O(OH) | — | — | — |
| Montroyalite | Sr₄Al₈(CO₃)₃(OH,F)₂₆ * 10-₁₁H₂O | Triclinic | — | — |
| Montroydite | HgO | — | 2.5 | 10.77 g/cm³ |
| Mooihoekite | Cu₉Fe₉S₁₆ | Tetragonal | 4.0 | 4.36 g/cm³ |
| Moolooite | Cu(C₂O₄)·nH₂O | Orthorhombic | — | — |
| Mooreite | Mg₉☐₂Mn₂Zn₄(SO₄)₂(OH)₂₆ * 8H₂O | Monoclinic | — | — |
| Moorhouseite | Co(SO₄)(H₂O)₆ | Monoclinic | — | — |
| Mopungite | Na[Sb⁵⁺(OH)₆] | — | — | — |
| Moraesite | Be₂PO₄(OH)·4H₂O | — | — | — |
| Moragite | Ca₃TiSi₂(Al₂Si)O₁₄ | Trigonal | — | — |
| Moraskoite | Na₂Mg(PO₄)F | Orthorhombic | — | 2.98 g/cm³ |
| Mordenite | (Na₂,Ca,K₂)₄(Al₈Si₄₀)O₉₆·28H₂O | Orthorhombic | — | — |
| Moreauite | Al₃(UO₂)(PO₄)₃(OH)₂ * 13H₂O | Monoclinic | — | — |
| Morelandite | Ca₂Ba₃(AsO₄)₃Cl | Hexagonal | — | — |
| Morenosite | NiSO₄·7H₂O | Orthorhombic | — | — |
| Morimotoite | Ca₃(Ti,Fe²⁺,Fe³⁺)₂((Si,Fe³⁺)O₄)₃ | Cubic | 7.5 | — |
| Morinite | NaCa₂Al₂(PO₄)₂(OH)F₄·2H₂O | Monoclinic | — | — |
| Morleyite | Ag₂CuPb₂₅Sb₂₄As₄S₆₈.₅ | Triclinic | — | — |
| Morozeviczite | (Pb,Fe)₃Ge₁-xS₄ | — | 3.5 | 6.62 g/cm³ |
| Morrisonite | Ca₁₁(H₂O)₇₈(As³⁺V⁴⁺₂V⁵⁺₁₀As⁵⁺₆O₅₁)₂ | Monoclinic | — | — |
| Mosandrite-(Ce) | (Ca₃REE)[(H₂O)₂Ca₀.₅☐₀.₅]Ti(Si₂O₇)₂(OH)₂(H₂O)₂ | Monoclinic | — | — |
| Moschelite | HgI | Tetragonal | — | 7.19 g/cm³ |
| Moschellandsbergite | Ag₂Hg₃ | Cubic | — | — |
| Mosesite | (Hg₂N)Cl | Cubic | — | — |
| Moskvinite-(Y) | Na₂KYSi₆O₁₅ | Orthorhombic | — | 2.75 g/cm³ |
| Mottanaite-(Ce) | Ca₄(Ce,REE)∑₂Al(Be₁.₅☐₀.₅)∑₂[B₄Si₄O₂₂]O₂ | — | — | — |
| Mottramite | PbCuVO₄(OH) | Orthorhombic | — | — |
| Motukoreaite | Mg₆Al₃(OH)₁₈[Na(H₂O)₆][SO₄]₂·6H₂O | Trigonal | — | — |
| Mounanaite | PbFe³⁺₂(VO₄)₂(OH,F)₂ | — | 4.5 | — |
| Mountainite | KNa₂Ca₂[Si₈O₁₉(OH)]·6H₂O | — | — | — |
| Mountkeithite | [(Mg₁-xFe³⁺x)(OH)₂][SO₄]x/₂ * nH₂O | — | — | — |
| Mourite | UMo₅O₁₂(OH)₁₀ | — | — | — |
| Moydite-(Y) | Y[B(OH)₄](CO₃) | Orthorhombic | — | — |
| Mozartite | CaMn³⁺(SiO₄)(OH) | — | — | — |
| Mozgovaite | PbBi₄S₇ | — | — | — |
| Moëloite | — | — | — | — |
| Mpororoite | WAlO₃(OH)₃ * 2(H₂O) | Monoclinic | — | — |
| Mroseite | CaTe₄+(CO₃)O₂ | Orthorhombic | — | — |
| Mrázekite | Bi₂Cu₃(PO₄)₂O₂(OH)₂·2H₂O | Monoclinic | — | — |
| Muirite | Ba₁₀Ca₂Mn²⁺Ti[HSi₂O₇]₅(OH,Cl,F)₅ | Tetragonal | — | — |
| Mukhinite | {Ca₂}{Al₂V³⁺}(Si₂O₇)(SiO₄)O(OH) | Monoclinic | — | — |
| Mullite | 3Al₂O₃·2SiO₂ | Orthorhombic | — | — |
| Mummeite | Cu₀.₅₈Ag₃.₁₁Pb₁.₁₀Bi₆.₆₅S₁₃ | Monoclinic | — | — |
| Munakataite | Pb₂Cu₂(Se⁴⁺O₃)(SO₄)(OH)₄ | Monoclinic | — | — |
| Mundite | Al(UO₂)₃(PO₄)₂(OH)₃ * 5.₅H₂O | Orthorhombic | — | — |
| Mundrabillaite | (NH₄)₂Ca(HPO₄)₂ * H₂O | Monoclinic | — | — |
| Munirite | NaVO₃ * 1.₉H₂O | Monoclinic | — | — |
| Muonionalustaite | Ni3(OH)4Cl2·4H2O | Monoclinic | — | — |
| Murakamiite | Ca₂LiSi₃O₈(OH) | Triclinic | — | — |
| Murashkoite | FeP | Orthorhombic | — | 6.37 g/cm³ |
| Murataite-(Y) | (Y,Na)₆Zn(Zn,Fe³⁺)₄(Ti,Nb,Na)₁₂O₂₉(O,F,OH)₁₀F₄ | Cubic | — | — |
| Murchisite | Cr₅S₆ | Trigonal | — | — |
| Murdochite | Cu₁₂Pb₂O₁₅Cl₂ | — | — | — |
| Murmanite | Na₂Ti₂Na₂Ti₂(Si₂O₇)O₄(H₂O)₄ | Triclinic | — | — |
| Murphyite | Pb(Te⁶⁺O₄) | Orthorhombic | — | — |
| Murunskite | K₂(Cu,Fe)₄S₄ | Tetragonal | — | — |
| Muscovite | KAl₂(Si₃Al)O₁₀(OH)₂ | Monoclinic | — | — |
| Museumite | [Pb₂(Pb,Sb)₂S₈][(Te,Au)₂] | Monoclinic | — | — |
| Mushistonite | (Cu,Zn,Fe²⁺)[Sn(OH)₆] | Cubic | — | — |
| Muskoxite | Mg₇Fe³⁺₄(OH)₂₆·H₂O | Trigonal | — | — |
| Muthmannite | AuAgTe₂ | Monoclinic | — | — |
| Mutinaite | Na₃Ca₄Si₈₅Al₁₁O₁₉₂ * 6₀H₂O | Orthorhombic | — | — |
| Mutnovskite | Pb₂AsS₃(I,Cl,Br) | Orthorhombic | 2.0 | — |
| Mélonjosephite | — | Orthorhombic | — | — |
| Möhnite | (NH₄)K₂Na(SO₄)₂ | Trigonal | — | — |
| Mössbauerite | Fe³⁺₆O₄(OH)₈(CO₃)·3H₂O | Trigonal | — | — |
| Mückeite | CuNiBiS₃ | Orthorhombic | — | — |
| Müllerite | Pb₂Fe³⁺(Te⁶⁺O₆)Cl | Trigonal | — | — |