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Grandfathered minerals
1,125 minerals
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Melonite | NiTe₂ | Trigonal | — | 7.50 g/cm³ |
| Mendipite | Pb₃O₂Cl₂ | Orthorhombic | — | — |
| Mendozite | NaAl(SO₄)₂·11H₂O | — | — | — |
| Meneghinite | Pb₁₃CuSb₇S₂₄ | Orthorhombic | 2.5 | — |
| Mercallite | KHSO₄ | Orthorhombic | — | 2.37 g/cm³ |
| Mercury (native) | Hg | Trigonal | — | 13.60 g/cm³ |
| Merwinite | Ca₃Mg(SiO₄)₂ | Monoclinic | — | — |
| Meta-autunite | Ca(UO₂)₂(PO₄)₂·6H₂O | Tetragonal | — | — |
| Metacinnabar | HgS | Cubic | 3.0 | 7.38 g/cm³ |
| 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 | — | — | — |
| Metarossite | CaV⁵⁺₂O₆·2H₂O | Triclinic | — | — |
| Metasaléeite | Mg(UO₂)₂(PO₄)₂·8H₂O | — | — | — |
| Metaschoepite | (UO₂)₈O₂(OH)₁₂ * 10H₂O | — | — | — |
| Metasideronatrite | Na₂Fe(SO₄)₂(OH) * H₂O | Orthorhombic | — | — |
| Metastibnite | Sb₂S₃ | Amorphous | — | — |
| Metatorbernite | Cu(UO₂)₂(PO₄)₂·8H₂O | Tetragonal | — | — |
| Metatyuyamunite | Ca(UO₂)₂(VO₄)₂·3H₂O | Monoclinic | — | — |
| Metavandendriesscheite | PbU₇O₂₂ * nH₂O n < ₁₂ | — | — | — |
| Metavauxite | Fe²⁺Al₂(PO₄)₂(OH)₂ * 8H₂O | Monoclinic | 3.0 | 2.35 g/cm³ |
| Metavoltine | Na₆K₂FeFe₆(SO₄)₁₂O₂·18H₂O | Trigonal | — | — |
| Metazeunerite | Cu(UO₂)₂(AsO₄)₂·8H₂O | Tetragonal | — | — |
| Meyerhofferite | CaB₃O₃(OH)₅·H₂O | Triclinic | — | — |
| Miargyrite | AgSbS₂ | Monoclinic | 2.5 | 5.04 g/cm³ |
| Microcline | KAlSi₃O₈ | Triclinic | 6.0 | 2.46 g/cm³ |
| Microsommite | Na₄K₂Ca₂(SO₄)(Si₆Al₆O₂₄)Cl₂ | Hexagonal | — | — |
| Miersite | (Ag,Cu)I | Cubic | — | — |
| 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 |
| Mimetite | Pb₅(AsO₄)₃Cl | Hexagonal | — | 6.86 g/cm³ |
| Minasragrite | (V₄+O)(SO₄) * 5H₂O | — | — | — |
| Minguzzite | K₃Fe³⁺(C₂O₄)₃·3H₂O | Monoclinic | — | 2.11 g/cm³ |
| Minium | Pb²⁺₂Pb⁴⁺O₄ | Tetragonal | — | — |
| Minnesotaite | Fe²⁺₃Si₄O₁₀(OH)₂ | Triclinic | — | — |
| Mirabilite | Na₂SO₄·10H₂O | Monoclinic | — | — |
| 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 | — | — |
| Mitscherlichite | K₂CuCl₄·2H₂O | — | — | — |
| Mixite | BiCu₆(AsO₄)₃(OH)₆ * 3H₂O | Hexagonal | — | — |
| Modderite | (Co,Fe)As | Orthorhombic | 4.0 | — |
| Moissanite | SiC | Hexagonal | 9.2 | 3.23 g/cm³ |
| Moluranite | H₄U₄+(UO₂)₃(MoO₄)₇ * 18H₂O | — | — | — |
| Molybdenite | MoS₂ | Hexagonal | — | 4.67 g/cm³ |
| Molybdophyllite | Pb₈Mg₉[Si₁₀O₂₈(OH)₈|O₂|(CO₃)₃] * H₂O | Monoclinic | — | — |
| Molysite | FeCl₃ | Hexagonal | — | — |
| Monetite | Ca(HPO₄) | Triclinic | — | 2.95 g/cm³ |
| Monohydrocalcite | CaCO₃ * H₂O | Trigonal | — | — |
| Montebrasite | LiAlPO₄(OH) | Triclinic | — | — |
| Monteponite | CdO | Cubic | 3.0 | 8.10 g/cm³ |
| 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 |
| Montroseite | (V³⁺,Fe²⁺,V⁴⁺)O(OH) | — | — | — |
| Montroydite | HgO | — | 2.5 | 10.77 g/cm³ |
| Mooreite | Mg₉☐₂Mn₂Zn₄(SO₄)₂(OH)₂₆ * 8H₂O | Monoclinic | — | — |
| Moraesite | Be₂PO₄(OH)·4H₂O | — | — | — |
| Morenosite | NiSO₄·7H₂O | Orthorhombic | — | — |
| Moschellandsbergite | Ag₂Hg₃ | Cubic | — | — |
| Mosesite | (Hg₂N)Cl | Cubic | — | — |
| Mottramite | PbCuVO₄(OH) | Orthorhombic | — | — |
| Mountainite | KNa₂Ca₂[Si₈O₁₉(OH)]·6H₂O | — | — | — |
| Mullite | 3Al₂O₃·2SiO₂ | Orthorhombic | — | — |
| Murdochite | Cu₁₂Pb₂O₁₅Cl₂ | — | — | — |
| Muthmannite | AuAgTe₂ | Monoclinic | — | — |
| Nacrite | Al₂Si₂O₅(OH)₄ | Monoclinic | — | — |
| Nadorite | PbSb³⁺O₂Cl | Orthorhombic | — | — |
| Nagyágite | [Pb(Pb,Sb)S₂][(Au,Te)] | Monoclinic | 1.5 | — |
| Nahcolite | NaHCO₃ | Monoclinic | 2.5 | 2.30 g/cm³ |
| Nantokite | CuCl | Cubic | 2.5 | — |
| Nasonite | Pb₆Ca₄(Si₂O₇)₃Cl₂ | Hexagonal | — | — |
| Native copper | Cu | Cubic | 2.8 | 8.50 g/cm³ |
| Native gold | Au | Cubic | 2.8 | 17.40 g/cm³ |
| Native silver | Ag | Cubic | 2.8 | 10.50 g/cm³ |
| Native zinc | Zn | Hexagonal | 2.0 | — |