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Trigonal crystal system
584 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Lucchesiite | CaFe²⁺₃ Al₆(Si₆O₁₈)(BO₃)₃(OH)₃O | 7.0 | — |
| Lévyne-Ca | Ca₃(Si₁₂Al₆)O₃₆·18H₂O | 4.0 | — |
| Lévyne-Na | Na₆(Si₁₂Al₆)O₃₆·18H₂O | — | — |
| Löweite | Na₁₂Mg₇(SO₄)₁₃·15H₂O | — | — |
| Macivorite | (NH₄)₃Al₅(PO₃OH)₆(PO₄)₂·18H₂O | — | — |
| Magnesio-dutrowite | Na(Mg₂.₅Ti₀.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃O | — | — |
| Magnesio-foitite | (☐,Na)(Mg₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH) | 7.0 | — |
| Magnesio-lucchesiite | CaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃O | — | — |
| Magnesiobeltrandoite-2N3S | (Mg₆Al₂)(Al₁₈(Fe³⁺)₂)O₃₈(OH)₂ | — | — |
| Magnesiochangesite-(Ce) | (Ca₈Ce)□Mg(PO₄)₇ | — | — |
| Magnesiochangesite-(Y) | (Ca₈Y)◻Mg(PO₄)₇ | — | — |
| Magnesiohögbomite-2N3S | [(Mg,Fe²⁺,Zn)₄(Al,Ti,Fe³⁺)₁₀O₁₉(OH)]₂ | — | — |
| Magnesiohögbomite-6N12S | — | — | — |
| Magnesiohögbomite-6N6S | [(Mg,Fe²⁺)₃(Al,Ti,Fe³⁺)₈O₁₅(OH)]₆ | — | — |
| Magnesite | MgCO₃ | — | 2.96 g/cm³ |
| Magselite | [Mg(H₂O)₆](Se⁴⁺O₃) | — | — |
| Malladrite | Na₂[SiF₆] | — | — |
| Manganoeudialyte | Na₁₄Ca₆Mn₃Zr₃[Si₂₆O₇₂(OH)₂](H₂O,Cl,O,OH)₆ | — | — |
| Manganokaskasite | (Mo,Nb)S₂·(Mn₁₋ₓAlₓ)(OH)₂₊ₓ | — | — |
| Manganokhomyakovite | Na₁₂Sr₃Ca₆Mn₃Zr₃W[Si₂₅O₇₃](O,OH,H₂O)₃(OH,Cl)₂ | — | — |
| Mapiquiroite | (Sr,Pb)(U,Y)Fe₂(Ti,Fe³⁺)₁₈O₃₈ | — | — |
| Marathonite | Pd₂₅Ge₉ | — | — |
| Marinellite | (Na,K)₄₂Ca₆(Al₆Si₆O₂₄)₆(SO₄)₈Cl₂ * 3H₂O | — | — |
| Martyite | Zn₃V₂O₇(OH)₂·2H₂O | — | — |
| Maruyamaite | K(MgAl₂)(Al₅Mg)(BO₃)₃(Si₆O₁₈)(OH)₃O | 7.0 | — |
| Mathiasite | (K, Ba, Sr)(Zr, Fe)(Mg,Fe)₂ (Ti,Cr,Fe)₁₈O₃₈ | — | — |
| Matildite | AgBiS₂ | 2.5 | — |
| Matyhite | Ca₁₈(Ca,☐)₂Fe²⁺₂(PO₄)₁₄ | — | — |
| Mcallisterite | Mg₂[B₆O₇(OH)₆]₂ * 9H₂O | — | — |
| Mcconnellite | CuCrO₂ | — | 5.60 g/cm³ |
| Melanostibite | Mn²⁺(Sb⁵⁺,Fe³⁺)O₃ | — | — |
| Melcherite | Ba₂Na₂Mg[Nb₆O₁₉]·6H₂O | — | — |
| Melonite | NiTe₂ | — | 7.50 g/cm³ |
| Mercury (native) | Hg | — | 13.60 g/cm³ |
| Merenskyite | PdTe₂ | — | 8.00 g/cm³ |
| Merrillite | Ca₉NaMg(PO₄)₇ | — | 3.03 g/cm³ |
| Mertieite | Pd₈Sb₂.₅As₀.₅ | — | — |
| Metavoltine | Na₆K₂FeFe₆(SO₄)₁₂O₂·18H₂O | — | — |
| Mianningite | (☐,Pb,Ce,Na)(U⁴⁺,Mn,U⁶⁺)Fe³⁺₂(Ti,Fe³⁺)₁₈O₃₈ | — | — |
| Mikasaite | Fe₂(SO₄)₃ | — | 3.04 g/cm³ |
| Millerite | NiS | 3.5 | 5.37 g/cm³ |
| Minrecordite | CaZn(CO₃)₂ | 3.5 | — |
| Mirnyite | — | — | — |
| Misakiite | Cu₃Mn(OH)₆Cl₂ | — | — |
| Mitrofanovite | Pt₃Te₄ | — | 10.64 g/cm³ |
| Mogovidite | Na₉(Ca,Na)₁₂Fe₂Zr₃Si₂₅O₇₂(CO₃) (OH)₄ | — | — |
| Mojaveite | Cu₆[Te⁶⁺O₄(OH)₂](OH)₇Cl | — | — |
| Monohydrocalcite | CaCO₃ * H₂O | — | — |
| Moragite | Ca₃TiSi₂(Al₂Si)O₁₄ | — | — |
| Motukoreaite | Mg₆Al₃(OH)₁₈[Na(H₂O)₆][SO₄]₂·6H₂O | — | — |
| Murchisite | Cr₅S₆ | — | — |
| Muskoxite | Mg₇Fe³⁺₄(OH)₂₆·H₂O | — | — |
| Möhnite | (NH₄)K₂Na(SO₄)₂ | — | — |
| Mössbauerite | Fe³⁺₆O₄(OH)₈(CO₃)·3H₂O | — | — |
| Müllerite | Pb₂Fe³⁺(Te⁶⁺O₆)Cl | — | — |
| Naalasite | NaAl(AsO₃OH)₂·H₂O | — | — |
| Nabimusaite | KCa₁₂(SiO₄)₄(SO₄)₂O₂F | — | — |
| Namuwite | Zn₄SO₄(OH)₆·4H₂O | — | — |
| Natroalunite | NaAl₃(SO₄)₂(OH)₆ | — | — |
| Natroaphthitalite | KNa₃(SO₄)₂ | — | — |
| Natrojarosite | NaFe³⁺₃(SO₄)₂(OH)₆ | — | — |
| Natrotantite | Na₂Ta₄O₁₁ | — | 7.67 g/cm³ |
| Nierite | Si₃N₄ | — | 3.20 g/cm³ |
| Nikmelnikovite | Ca₁₂Fe²⁺Fe³⁺₃Al₃(SiO₄)₆(OH)₂₀ | — | — |
| Nipeiite-(Ce) | Ce₉Fe³⁺(SiO₄)₆[SiO₃(OH)](OH)₃ | — | — |
| Nitratine | NaNO₃ | — | 2.35 g/cm³ |
| Nordenskiöldine | CaSn⁴⁺(BO₃)₂ | — | — |
| Norilskite | (Pd,Ag)₂₋ₓPb (0.08 ≤ x ≤ 0.11) | — | — |
| Norsethite | BaMg(CO₃)₂ | 3.5 | — |
| Nowackiite | Cu₆Zn₃As₄S₁₂ | — | — |
| Nukundamite | Cu₃.₄Fe₀.₆S₄ | 3.0 | — |
| Oboniobite | Mg₄Nb₂O₉ | — | 4.35 g/cm³ |
| Ognitite | NiBiTe | — | — |
| Olekminskite | Sr(Sr,Ca,Ba)(CO₃)₂ | 3.0 | — |
| Olenite | Na(Al₃)Al₆(Si₆O₁₈)(BO₃)₃O₃(OH) | 7.0 | — |
| Olgite | Na(Na,Sr)₂Ba(PO₄)₂ | — | — |
| Omsite | Ni₂Fe³⁺(OH)₆[Sb(OH)₆] | — | — |
| Oneillite | Na₁₅Ca₃Mn₃Fe²⁺₃Zr₃Nb(Si₂₅O₇₃)(O,OH,H₂O)₃(OH,Cl)₂ | — | — |
| Oreillyite | Cr₂N | — | — |
| Osarizawaite | CuPbAl₂(SO₄)₂(OH)₆ | — | — |