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Grandfathered minerals
1,125 minerals
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Stottite | Fe²⁺Ge⁴⁺(OH)₆ | — | 4.5 | — |
| Strengite | FePO₄ * 2H₂O | Orthorhombic | 3.5 | — |
| Stromeyerite | CuAgS | Orthorhombic | — | — |
| Strontianite | Sr(CO₃) | Orthorhombic | 3.5 | 3.78 g/cm³ |
| Strontioginorite | CaSrB₁₄O₂₀(OH)₆ * 5H₂O | Monoclinic | — | — |
| Strunzite | Mn²⁺Fe₂³⁺(PO₄)₂(OH)₂·8H₂O | — | 4.0 | — |
| Struvite | H₁₆MgNO₁₀P | Orthorhombic | 2.0 | — |
| Studtite | [(UO₂)(O₂)(H₂O)₂] * H₂O | — | — | — |
| Sulfoborite | Mg₃[B(OH)₄]₂(SO₄)(OH,F)₂ | Orthorhombic | — | — |
| Sulphohalite | Na₆(SO₄)₂FCl | Cubic | — | — |
| Sulphur | S | Orthorhombic | — | — |
| Sulvanite | Cu₃VS₄ | Cubic | 3.5 | 3.97 g/cm³ |
| Sursassite | Mn²⁺₂Al₃(SiO₄)(Si₂O₇)(OH)₃ | Monoclinic | — | — |
| Susannite | Pb₄(SO₄)(CO₃)₂(OH)₂ | Trigonal | — | — |
| Sussexite | Mn²⁺BO₂(OH) | Orthorhombic | — | — |
| Svabite | Ca₅(AsO₄)₃F | Hexagonal | — | 3.59 g/cm³ |
| Swartzite | MgCa(UO₂)(CO₃)₃ * 12H₂O | Monoclinic | — | — |
| Swedenborgite | NaBe₄Sb⁵⁺O₇ | Hexagonal | — | — |
| Sylvanite | AgAuTe₄ | Monoclinic | 1.8 | 8.10 g/cm³ |
| Sylvite | KCl | Cubic | 2.0 | 1.99 g/cm³ |
| Symplesite | Fe²⁺₃(AsO₄)₂ * 8H₂O | Triclinic | — | — |
| Synadelphite | Mn²⁺₉(As₅+O₄)₂(As³⁺O₃)(OH)₉ · 2H₂O | — | — | — |
| Syngenite | K₂Ca(SO₄)₂·H₂O | Monoclinic | 2.5 | — |
| Szaibélyite | MgBO₂(OH) | Monoclinic | — | 2.66 g/cm³ |
| Szmikite | Mn(SO₄)(H₂O) | Monoclinic | — | — |
| Szomolnokite | Fe²⁺SO₄·H₂O | Monoclinic | — | — |
| Tacharanite | Ca₁₂Al₂Si₁₈O₃₃(OH)₃₆ | Monoclinic | — | — |
| Tachyhydrite | CaMg₂Cl₆·12H₂O | Trigonal | 2.0 | — |
| Taenite | (Ni,Fe) | Cubic | — | — |
| Tainiolite | KLiMg₂Si₄O₁₀F₂ | Monoclinic | — | — |
| Talc | — | Hexagonal | 1.0 | 2.75 g/cm³ |
| Tamarugite | NaAl(SO₄)₂·6H₂O | Monoclinic | — | — |
| Tantalcarbide | TaC | Cubic | — | 14.37 g/cm³ |
| Taramellite | Ba₄(Fe³⁺,Ti,Fe²⁺,Mg)₄(B₂Si₈O₂₇)O₂Clx | — | — | — |
| Taranakite | K₃Al₅(PO₃OH)₆(PO₄)₂·18H₂O | Trigonal | — | — |
| Tarapacáite | K₂CrO₄ | Orthorhombic | — | — |
| Tarbuttite | Zn₂(PO₄)(OH) | Triclinic | — | — |
| Tavorite | LiFe³⁺(PO₄)(OH) | — | — | — |
| Teallite | PbSnS₂ | Orthorhombic | 1.5 | — |
| Teepleite | Na₂[B(OH)₄]Cl | Tetragonal | — | — |
| Teineite | Cu²⁺Te⁴⁺O₃·2H₂O | — | — | — |
| Telluric iron | Fe | Cubic | — | — |
| Tellurite | TeO₂ | Tetragonal | 2.0 | — |
| Tellurium | Te | Trigonal | — | — |
| Tellurobismuthite | Bi₂Te₃ | Trigonal | — | 7.32 g/cm³ |
| Tephroite | Mn²⁺₂SiO₄ | Orthorhombic | 6.0 | — |
| Terlinguaite | Hg₂OCl | Monoclinic | — | — |
| Teschemacherite | (NH₄)HCO₃ | Orthorhombic | 1.5 | 1.61 g/cm³ |
| Tetradymite | Bi₂Te₂S | Trigonal | — | 7.09 g/cm³ |
| Thaumasite | Ca₃Si(OH)₆(SO₄)(CO₃)·12H₂O | Hexagonal | 3.5 | — |
| Thermonatrite | Na₂CO₃·H₂O | Orthorhombic | — | — |
| Thomsenolite | NaCaAlF₆·H₂O | Monoclinic | 2.0 | — |
| Thoreaulite | (Sn²⁺,Pb)(Ta,Nb)₂O₆ | — | — | — |
| Thorianite | ThO₂ | Cubic | — | 9.98 g/cm³ |
| Thorite | ThSiO₄ | Tetragonal | — | 6.66 g/cm³ |
| Thortveitite | Sc₂Si₂O₇ | Monoclinic | — | 3.37 g/cm³ |
| Thorutite | (Th,U,Ca)Ti₂(O,OH)₆ | — | — | — |
| Tiemannite | HgSe | Cubic | — | 8.31 g/cm³ |
| Tilasite | CaMg(AsO₄)F | Monoclinic | — | 3.63 g/cm³ |
| Tilleyite | Ca₅Si₂O₇(CO₃)₂ | Monoclinic | — | — |
| Tin (native) | Sn | Tetragonal | — | — |
| Tincalconite | Na₂B₄O₅(OH)₄·3H₂O | Trigonal | — | — |
| Tinticite | Fe³⁺₅.₃₄(PO₄)₃.₆₂(VO₄)₀.₃₈(OH)₄·3H₂O | Triclinic | — | — |
| Topaz | Al₂SiO₄F₂ | Orthorhombic | 8.0 | 3.53 g/cm³ |
| Torreyite | — | Monoclinic | — | — |
| Tosudite | Na₀.₅(Al,Mg)₆((Si,Al)₈O₁₈)(OH)₁₂·5H₂O | — | — | — |
| Trechmannite | AgAsS₂ | — | — | — |
| Trevorite | NiFe³⁺₂O₄ | Cubic | — | — |
| Tridymite | SiO₂ | Orthorhombic | 7.0 | 2.63 g/cm³ |
| Trigonite | Pb₃Mn²⁺(As³⁺O₃)₂(As³⁺O₂OH) | — | — | — |
| Trikalsilite | K₂NaAl₃(SiO₄)₃ | Hexagonal | — | — |
| Trimerite | CaBe₃Mn²⁺₂(SiO₄)₃ | Monoclinic | — | — |
| Triphylite | LiFe²⁺PO₄ | Orthorhombic | — | — |
| Triplite | Mn²⁺₂PO₄F | Monoclinic | — | — |
| Triploidite | (Mn²⁺,Fe²⁺)₂(PO₄)(OH) | — | — | — |
| Trippkeite | Cu²⁺As³⁺₂O₄ | Tetragonal | — | — |
| Trogtalite | CoSe₂ | Cubic | 7.0 | 6.90 g/cm³ |
| Troilite | FeS | Hexagonal | — | 4.29 g/cm³ |
| Trolleite | Al₄(PO₄)₃(OH)₃ | Monoclinic | — | — |
| Trona | Na₃(HCO₃)(CO₃)·2H₂O | Monoclinic | — | — |