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Monoclinic crystal system
1,774 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Masutomilite | (K,Rb)(Li,Mn³⁺,Al)₃(AlSi₃O₁₀)(F,OH)₂ | — | — |
| Matsubaraite | Sr₄Ti₅(Si₂O₇)₂O₈ | — | — |
| Matteuccite | NaHSO₄ * H₂O | — | — |
| Mawbyite | Pb(Fe₁.₅,Zn₀.₅)(AsO₄)₂(OH)₁.₅(H₂O)₀.₅ | 4.0 | 5.37 g/cm³ |
| Mbobomkulite | (Ni,Cu)Al₄((NO₃)₂,SO₄)(OH)₁₂ * 3H₂O | — | — |
| Mcguinnessite | CuMgCO₃(OH)₂ | 2.5 | — |
| Mckelveyite-(Nd) | NaCaBa₃Nd(CO₃)₆·3H₂O | — | — |
| Medaite | Mn²⁺₆V₅+Si₅O₁₈(OH) | — | — |
| Medvedevite | — | — | — |
| Meerschautite | (Ag,Cu)₆Pb₄₃-₂ₓSb₄₄₊₂ₓS₁₁₂Oₓ (x~0.5) | — | — |
| Megacyclite | Na₈KSi₉O₁₈(OH)₉ * 19H₂O | — | — |
| Meizhouite | Fe²⁺V³⁺₂(PO₄)₂(OH)₂ | — | — |
| Melanarsite | K₃Cu₇Fe³⁺O₄(AsO₄)₄ | — | — |
| Melanterite | Fe²⁺SO₄·7H₂O | 2.0 | — |
| Menchettiite | Pb₅Mn₃Ag₂Sb₆As₄S₂₄ | — | — |
| Mendozavilite-KCa | [K₂(H₂O)₁₅Ca(H₂O)₆][Mo₈P₂Fe³⁺₃O₃₄(OH)₃] | — | — |
| Mendozavilite-NaCu | [Na₂(H₂O)₁₅Cu(H₂O)₆][Mo₈P₂Fe³⁺₃O₃₄(OH)₃] | — | — |
| Mendozavilite-NaFe | [Na₂(H₂O)₁₅Fe³⁺(H₂O)₆][Mo₈P₂Fe³⁺₃O₃₅(OH)₂] | — | — |
| Mereheadite | Pb₄₇Cl₂₅(OH)₁₃O₂₄(CO₃)(BO₃)₂ | 3.5 | — |
| Merwinite | Ca₃Mg(SiO₄)₂ | — | — |
| Mesaite | CaMn²⁺₅(V₂O₇)₃·12H₂O | — | — |
| Metaheimite | PbCu₂(AsO₄)(OH)₃ | — | — |
| Metahewettite | CaV⁵⁺₆O₁₆·3H₂O | — | — |
| Metaswitzerite | Mn²⁺₃(PO₄)₂ * 4H₂O | — | — |
| Metatamboite | Fe³⁺₃(OH)(H₂O)₂(SO₄)(Te₄+O₃)₃(Te₄+O(OH)₂)(H₂O) | — | — |
| Metatyuyamunite | Ca(UO₂)₂(VO₄)₂·3H₂O | — | — |
| Metavariscite | AlPO₄·2H₂O | 3.5 | — |
| Metavauxite | Fe²⁺Al₂(PO₄)₂(OH)₂ * 8H₂O | 3.0 | 2.35 g/cm³ |
| Meurigite-K | KFe³⁺₈(PO₄)₆(OH)₇ * 6.₅H₂O | — | — |
| Meurigite-Na | [Na(H₂O)₂.₅][Fe³⁺₈(PO₄)₆(OH)₇(H₂O)₄] | — | — |
| Meyrowitzite | Ca(UO₂)(CO₃)₂·5H₂O | — | — |
| Miargyrite | AgSbS₂ | 2.5 | 5.04 g/cm³ |
| Middendorfite | K₃Na₂Mn₅Si₁₂(O,OH)₃₆·2H₂O | — | — |
| Middlebackite | Cu₂C₂O₄(OH)₂ | — | — |
| Miguelromeroite | MnMn₂Mn₂(AsO₄)₂(HAsO₄)₂ * 4H₂O | — | — |
| Mikecoxite | [CHg₄]OCl₂ | — | — |
| Mikenewite | Mn²⁺(S⁴⁺O₃)·3H₂O | — | — |
| Millsite | Cu²⁺(Te₄+O₃)·2H₂O | — | — |
| Minguzzite | K₃Fe³⁺(C₂O₄)₃·3H₂O | — | 2.11 g/cm³ |
| Mirabilite | Na₂SO₄·10H₂O | — | — |
| Misenite | K₈H₆(SO₄)₇ | — | — |
| Mitridatite | Ca₂Fe³⁺₃O₂(PO₄)₃(H₂O)₂·H₂O | — | — |
| Moctezumite | Pb(UO₂)(TeO₃)₂ | 3.0 | 7.28 g/cm³ |
| Mogánite | SiO₂·nH₂O | — | — |
| Mohite | Cu₂SnS₃ | — | — |
| Molybdofornacite | CuPb₂MoO₄AsO₄(OH) | — | 6.60 g/cm³ |
| Molybdophyllite | Pb₈Mg₉[Si₁₀O₂₈(OH)₈|O₂|(CO₃)₃] * H₂O | — | — |
| Monazite-(Ce) | CePO₄ | — | 5.19 g/cm³ |
| Monazite-(Gd) | Gd(PO₄) | — | 5.55 g/cm³ |
| Monazite-(La) | LaPO₄ | — | 5.07 g/cm³ |
| Monazite-(Nd) | NdPO₄ | — | 5.42 g/cm³ |
| Monazite-(Sm) | SmPO₄ | — | — |
| Monteneroite | — | — | — |
| Montgomeryite | Ca₄MgAl₄(PO₄)₆(OH)₄ * 12H₂O | — | — |
| Montmorillonite | (Na,Ca)₀.₃₃(Al,Mg)₂(Si₄O₁₀)(OH)₂ * nH₂O | 1.3 | 1.80 g/cm³ |
| Mooreite | Mg₉☐₂Mn₂Zn₄(SO₄)₂(OH)₂₆ * 8H₂O | — | — |
| Moorhouseite | Co(SO₄)(H₂O)₆ | — | — |
| Moreauite | Al₃(UO₂)(PO₄)₃(OH)₂ * 13H₂O | — | — |
| Morinite | NaCa₂Al₂(PO₄)₂(OH)F₄·2H₂O | — | — |
| Morrisonite | Ca₁₁(H₂O)₇₈(As³⁺V⁴⁺₂V⁵⁺₁₀As⁵⁺₆O₅₁)₂ | — | — |
| Mosandrite-(Ce) | (Ca₃REE)[(H₂O)₂Ca₀.₅☐₀.₅]Ti(Si₂O₇)₂(OH)₂(H₂O)₂ | — | — |
| Mpororoite | WAlO₃(OH)₃ * 2(H₂O) | — | — |
| Mrázekite | Bi₂Cu₃(PO₄)₂O₂(OH)₂·2H₂O | — | — |
| Mukhinite | {Ca₂}{Al₂V³⁺}(Si₂O₇)(SiO₄)O(OH) | — | — |
| Mummeite | Cu₀.₅₈Ag₃.₁₁Pb₁.₁₀Bi₆.₆₅S₁₃ | — | — |
| Munakataite | Pb₂Cu₂(Se⁴⁺O₃)(SO₄)(OH)₄ | — | — |
| Mundrabillaite | (NH₄)₂Ca(HPO₄)₂ * H₂O | — | — |
| Munirite | NaVO₃ * 1.₉H₂O | — | — |
| Muonionalustaite | Ni3(OH)4Cl2·4H2O | — | — |
| Muscovite | KAl₂(Si₃Al)O₁₀(OH)₂ | — | — |
| Museumite | [Pb₂(Pb,Sb)₂S₈][(Te,Au)₂] | — | — |
| Muthmannite | AuAgTe₂ | — | — |
| Nabalamprophyllite | (BaNa)Ti₂Na₃Ti(Si₂O₇)₂O₂(OH)₂ | — | — |
| Nacareniobsite-(Ce) | (Ca₃REE)Na₃Nb(Si₂O₇)₂(OF)F₂ | — | — |
| Nacareniobsite-(Nd) | Ca₂(CaNd)Na₃Nb(Si₂O₇)₂(OF)F₂ | — | — |
| Nacareniobsite-(Y) | Na₃Ca₃YNb(Si₂O₇)₂OF₃ | — | — |
| Nacrite | Al₂Si₂O₅(OH)₄ | — | — |
| Nafeasite | — | — | — |
| Nafertisite | Na₃Fe²⁺₁₀Ti₂(Si₆O₁₇)₂O₂(OH)₆F(H₂O)₂ | — | — |
| Nagyágite | [Pb(Pb,Sb)S₂][(Au,Te)] | 1.5 | — |