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Approved minerals
4,194 minerals
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Thorneite | Pb₆(Te₂O₁₀)(CO₃)Cl₂(H₂O) | Monoclinic | — | — |
| Thorosteenstrupine | (Ca,Th,Mn)₃Si₄O₁₁F·6H₂O | Amorphous | — | — |
| Threadgoldite | Al(UO₂)₂(PO₄)₂(OH)·8H₂O | — | — | — |
| Thunderbayite | TlAg₃Au₃Sb₇S₆ | Triclinic | 3.0 | 5.69 g/cm³ |
| Tianhuixinite | (MoO₃)₃·H₂O | — | — | — |
| Tiberiobardiite | {Cu₉Al[SiO₃(OH)]₂(OH)₁₂(H₂O)₆}(SO₄)₁.₅·10H₂O | Trigonal | — | — |
| Tienshanite | KNa₃Na₆Ca₂Ba₆Mn₆(Ti₄+,Nb)₆B₁₂Si₃₆O₁₁₄(O,OH,F)₁₁ | Hexagonal | — | — |
| Tikhonenkovite | SrAlF₄(OH)(H₂O)₂ | Monoclinic | — | — |
| Tilkerodeite | — | Trigonal | 3.0 | 9.67 g/cm³ |
| Tillmannsite | (Ag₃Hg)(VO₄,AsO₄) | Tetragonal | — | — |
| Timroseite | Pb₂Cu₅(TeO₆)₂(OH)₂ | Orthorhombic | — | — |
| Tinaksite | K₂Na(Ca,Mn²⁺)₂Ti[O|Si₇O₁₈(OH)] | — | — | — |
| Tinnunculite | C₅H₄N₄O₃·2H₂O | Monoclinic | — | — |
| Tinsleyite | KAl₂(PO₄)₂(OH)(H₂O)₂ | Monoclinic | — | — |
| Tintinaite | Pb₁₀Cu₂Sb₁₆S₃₅ | Orthorhombic | — | — |
| Tiptopite | K₂(Li,Na,Ca)₆(Be₆P₆)O₂₄(OH)₂·1.3H₂O | Hexagonal | 3.5 | — |
| Tiragalloite | Mn²⁺₄As₅+Si₃O₁₂(OH) | Monoclinic | — | — |
| Tischendorfite | Pd₈Hg₃Se₉ | Orthorhombic | — | 8.87 g/cm³ |
| Tisinalite | Na₃H₃(Mn,Ca,Fe)TiSi₆(O,OH)₁₈ * 2H₂O | Trigonal | — | — |
| Tissintite | (Ca,Na,☐)AlSi₂O₆ | Monoclinic | — | — |
| Tistarite | Ti₂O₃ | Trigonal | — | — |
| Titanite | CaTiSiO₅ | Monoclinic | 5.5 | 3.42 g/cm³ |
| Titanium (native) | Ti | Hexagonal | — | — |
| Titanoholtite | (Ti₀.₇₅☐₀.₂₅)Al₆BSi₃O₁₈ | Orthorhombic | — | — |
| Titanowodginite | Mn²⁺TiTa₂O₈ | — | — | — |
| Titantaramellite | Ba₄(Ti,Fe³⁺,Fe²⁺,Mg)₄(B₂Si₈O₂₇)O₂Clx | — | — | — |
| Tivanite | V³⁺TiO₃(OH) | — | — | — |
| Tlalocite | Cu₁₀Zn₆(Te₆+O₄)₂(Te₄+O₃)(OH)₂₅Cl·27H₂O | Orthorhombic | 1.0 | — |
| Tlapallite | (Ca,Pb)₃CaCu₆[Te₄+₃Te₆+O₁₂]₂(Te₄+O₃)₂(SO₄)₂·3H₂O | Monoclinic | — | — |
| Tobelite | (NH₄,K)Al₂(AlSi₃O₁₀)(OH)₂ | — | — | — |
| Tochilinite | Fe²⁺₅-₆(Mg,Fe²⁺)₅S₆(OH)₁₀ | — | — | — |
| Todorokite | (Na,Ca,K,Ba,Sr)₁-x(Mn,Mg,Al)₆O₁₂·3-4H₂O | Monoclinic | — | — |
| Tokkoite | K₂Ca₄[Si₇O₁₈(OH)](OH,F) | — | — | — |
| Tokyoite | Ba₂Mn³⁺(VO₄)₂(OH) | Monoclinic | — | — |
| Tolbachite | CuCl₂ | Monoclinic | — | 3.26 g/cm³ |
| Toledoite | TiFeSi | Orthorhombic | — | 5.62 g/cm³ |
| Tolovkite | IrSbS | Cubic | — | 10.26 g/cm³ |
| Tomamaeite | Cu₃Pt | Cubic | — | 12.82 g/cm³ |
| Tombstoneite | — | Trigonal | — | — |
| Tomcampbellite | [KCl][Fe²⁺₁₄(OH)₆(PO₄)₆(PO₃OH)₂] | Monoclinic | — | — |
| Tomichite | V³⁺₄Ti⁴⁺₃As³⁺O₁₃(OH) | — | — | — |
| Tomiolloite | — | Hexagonal | — | — |
| Tondiite | Cu₃MgCl₂(OH)₆ | Trigonal | — | — |
| Tongbaite | Cr₃C₂ | Orthorhombic | 8.5 | 6.92 g/cm³ |
| Tooeleite | Fe³⁺₆(As³⁺O₃)₄(SO₄)(OH)₄·4H₂O | — | 3.0 | — |
| Topsøeite | — | Tetragonal | — | — |
| Torbernite | Cu(UO₂)₂(PO₄)₂·12H₂O | Tetragonal | — | — |
| Torrecillasite | Na(As,Sb)³⁺₄O₆Cl | Orthorhombic | — | — |
| Torryweiserite | — | Trigonal | — | — |
| Toturite | Ca₃Sn₂(SiFe³⁺₂)O₁₂ | Cubic | — | — |
| Tounkite | (Na,Ca,K)₈(Al₆Si₆O₂₄)(SO₄)₂Cl·0.5H₂O | Hexagonal | — | — |
| Touretite | LiAl₄Be₄(B₁₁Be)O₂₈ | Cubic | — | — |
| Townendite | Na₈ZrSi₆O₁₈ | Trigonal | — | — |
| Trabzonite | Ca₄(Si₃O₉)(OH)₂ | Monoclinic | — | — |
| Tranquillityite | (Fe²⁺,Ca)₈(Zr,Y)₂Ti₃(SiO₄)₃O₁₂ | Hexagonal | — | — |
| Transjordanite | Ni₂P | Hexagonal | — | — |
| Traskite | Ba₂₁Ca(Fe²⁺,Mn,Ti)₄(Ti,Fe,Mg)₁₂(Si₁₂O₃₆)(Si₂O₇)₆(O,OH)₃₀Cl₆·14H₂O | Hexagonal | — | — |
| Trattnerite | ☐(Fe³⁺,Mg,Fe²⁺)₂(Mg,Fe²⁺,Fe³⁺)₃(Si₁₂O₃₀) | — | — | — |
| Treasurite | Ag₇Pb₆Bi₁₅S₃₀ | Monoclinic | — | — |
| Trebiskyite | Na₃Mg₂[TiV₉O₂₈]·22H₂O | Monoclinic | — | — |
| Tredouxite | NiSb₂O₆ | Tetragonal | — | 6.61 g/cm³ |
| Trembathite | (Mg,Fe)₃(B₇O₁₃)Cl | Trigonal | — | — |
| Triangulite | Al₃(UO₂)₄(PO₄)₄(OH)₅·5H₂O | — | — | — |
| Triazolite | NaCu₂(N₃C₂H₂)₂(NH₃)₂Cl₃·4H₂O | Orthorhombic | — | — |
| Trimounsite-(Y) | Y₂Ti₂(SiO₄)O₅ | Monoclinic | — | — |
| Trinepheline | NaAlSiO₄ | Hexagonal | — | 2.58 g/cm³ |
| Tristramite | (Ca,U,Fe)(PO₄,SO₄)·2H₂O | Hexagonal | — | — |
| Trébeurdenite | Fe²⁺₂Fe³⁺₄O₂(OH)₁₀(CO₃)·3H₂O | Trigonal | — | — |
| Trüstedtite | Ni₃Se₄ | Cubic | — | — |
| Tsangpoite | Ca₅(PO₄)₂(SiO₄) | Hexagonal | — | — |
| Tsaregorodtsevite | (N(CH₃)₄)(AlSi₅O₁₂) | Orthorhombic | — | — |
| Tschaunerite | (Fe²⁺)(Fe²⁺Ti₄+)O₄ | Orthorhombic | — | — |
| Tschernichite | CaAl₂Si₆O₁₆·8H₂O | Tetragonal | — | — |
| Tschörtnerite | Ca₄(K,Ca,Sr,Ba)₃Cu₃Al₁₂Si₁₂O₄₈(OH)₈·20H₂O | Cubic | — | — |
| Tsepinite-Ca | (Ca,K,Na)₂₋ₓ(Ti,Nb)₂(Si₄O₁₂)(OH,O)₂·4H₂O | — | — | — |
| Tsepinite-K | (K,Ba,Na)₂(Ti,Nb)₂(Si₄O₁₂)(OH,O)₂·3H₂O | — | — | — |
| Tsepinite-Sr | (Sr,Ba,K)(Ti,Nb)₂(Si₄O₁₂)(OH,O)₂·3H₂O | Monoclinic | — | — |
| Tsikourasite | Mo₃Ni₂P₁₊ₓ | Cubic | — | — |
| Tsilaisite | NaMn²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH) | Trigonal | 7.0 | — |
| Tsnigriite | Ag₉SbTe₃S₃ | — | — | — |