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Orthorhombic crystal system
1,001 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Thomsonite-Ca | NaCa₂(Al₅Si₅)O₂₀·6H₂O | — | — |
| Thomsonite-Sr | NaSr₂Al₅Si₅O₂₀·(6-7)H₂O | — | — |
| Thénardite | Na₂SO₄ | — | 2.74 g/cm³ |
| Tiettaite | (Na,K)₁₇FeTiSi₁₆O₂₉(OH)₃₀·2H₂O | — | — |
| Timroseite | Pb₂Cu₅(TeO₆)₂(OH)₂ | — | — |
| Tintinaite | Pb₁₀Cu₂Sb₁₆S₃₅ | — | — |
| Tischendorfite | Pd₈Hg₃Se₉ | — | 8.87 g/cm³ |
| Titanoholtite | (Ti₀.₇₅☐₀.₂₅)Al₆BSi₃O₁₈ | — | — |
| Tlalocite | Cu₁₀Zn₆(Te₆+O₄)₂(Te₄+O₃)(OH)₂₅Cl·27H₂O | 1.0 | — |
| Tobermorite | Ca₄Si₆O₁₇(H₂O)₂·(Ca·3H₂O | — | — |
| Toledoite | TiFeSi | — | 5.62 g/cm³ |
| Tongbaite | Cr₃C₂ | 8.5 | 6.92 g/cm³ |
| Topaz | Al₂SiO₄F₂ | 8.0 | 3.53 g/cm³ |
| Torrecillasite | Na(As,Sb)³⁺₄O₆Cl | — | — |
| Triazolite | NaCu₂(N₃C₂H₂)₂(NH₃)₂Cl₃·4H₂O | — | — |
| Tridymite | SiO₂ | 7.0 | 2.63 g/cm³ |
| Triphylite | LiFe²⁺PO₄ | — | — |
| Tsaregorodtsevite | (N(CH₃)₄)(AlSi₅O₁₂) | — | — |
| Tschaunerite | (Fe²⁺)(Fe²⁺Ti₄+)O₄ | — | — |
| Tsumgallite | GaO(OH) | — | 5.20 g/cm³ |
| Tungstibite | Sb₂WO₆ | — | — |
| Tyuyamunite | Ca(UO₂)₂(VO₄)₂·5-8H₂O | — | — |
| Uchucchacuaite | AgMnPb₃Sb₅S₁₂ | — | — |
| Umbite | K₂ZrSi₃O₉·H₂O | 4.5 | — |
| Umbrianite | K₇Na₂Ca₂[Al₃Si₁₀O₂₉]F₂Cl₂ | — | — |
| Urancalcarite | Ca(UO₂)₃(CO₃)(OH)₆·3H₂O | — | — |
| Uranopolycrase | (U,Y)(Ti,Nb,Ta)₂(O,OH)₆ | — | — |
| Uranosilite | (UO₂)Si₇O₁₅ | — | — |
| Uranospathite | (Al,☐)(UO₂)₂F(PO₄)₂·20H₂O | — | — |
| Uranotungstite | Fe(UO₂)₂(WO₄)(OH)₄·12H₂O | — | — |
| Uvanite | (UO₂)₂V⁵⁺₆O₁₇·15H₂O (?) | — | — |
| Valentinite | Sb₂O₃ | — | — |
| Vanadiocarpholite | Mn²⁺V³⁺AlSi₂O₆(OH)₄ | — | — |
| Vandendriesscheite | Pb₁.₆(UO₂)₁₀O₆(OH)₁₁·11H₂O | 3.0 | 5.45 g/cm³ |
| Vanmeersscheite | U(UO₂)₃(PO₄)₂(OH)₆·4H₂O | — | — |
| Vantasselite | Al₄(PO₄)₃(OH)₃·9H₂O | — | — |
| Varennesite | Na₈Mn₂Si₁₀O₂₅(OH,Cl)₂·12H₂O | — | — |
| Variscite | Al(PO₄)·2H₂O | 4.5 | — |
| Vashegyite | Al₁₁(PO₄)₉(OH)₆·38H₂O | — | — |
| Vegrandisite | BaCl₂ | — | 3.45 g/cm³ |
| Verbeekite | PdSe₂ | — | 6.36 g/cm³ |
| Verbierite | BeCr³⁺₂TiO₆ | — | — |
| Vergasovaite | Cu₃(SO₄)(MoO₄,SO₄)O | — | — |
| Versiliaite | Fe₂Fe₄Sb₆O₁₆S | — | — |
| Viskontite | Pb₅Cu₂(SO₄)₃(SeO₃)(OH)₆ | — | — |
| Vitusite-(Ce) | Na₃(Ce,La,Nd)(PO₄)₂ | — | — |
| Vladimirivanovite | Na₆Ca₂(Al₆Si₆O₂₄)(SO₄,S₃,S₂,Cl)₂ * H₂O | — | — |
| Vladkrivovichevite | [Pb₃₂O₁₈][Pb₄Mn₂O]Cl₁₄(BO₃)₈*₂H₂O | — | — |
| Vondechenite | — | — | — |
| Vonsenite | Fe²⁺₂Fe³⁺O₂(BO₃) | 5.0 | — |
| Vrbaite | Hg₃Tl₄As₈Sb₂S₂₀ | — | — |
| Vuagnatite | CaAl(SiO₄)(OH) | — | — |
| Vulcanite | CuTe | — | 6.71 g/cm³ |
| Vyacheslavite | U(PO₄)(OH) * nH₂O | — | — |
| Vyalsovite | FeCaAlS(OH)₅ | — | — |
| Wadsleyite | Mg₂SiO₄ | — | 3.24 g/cm³ |
| Waimirite-(Y) | YF₃ | — | 5.08 g/cm³ |
| Wakabayashilite | [(As,Sb)₆S₉][As₄S₅] | 1.5 | — |
| Walentaite | Fe³⁺₃(P₀.₈₄As₀.₁₆O₄)₂(O,OH)₆As³⁺₂.₅₆Ca₀.₄₂Na₀.₂₈Mn²⁺₀.₃₅Fe²⁺₀.₃₀O₆.₁(OH)₀.₉(H₂O)₀.₉ | — | — |
| Walkerite | Ca₁₆(Mg,Li,☐)₂[B₁₃O₁₇(OH)₁₂]₄Cl₆*₂₈H₂O | — | — |
| Warwickite | (Mg,Ti,Fe,Cr,Al)₂O(BO₃) | — | — |
| Watanabeite | Cu₄(As,Sb)₂S₅ | — | — |
| Wattevilleite | Na₂Ca(SO₄)₂·4H₂O (?) | — | — |
| Wavellite | Al₃(PO₄)₂(OH)₃·5H₂O | — | — |
| Weberite | Na₂MgAlF₇ | 3.5 | 2.84 g/cm³ |
| Weibullite | Ag₀.₃Pb₅.₃Bi₈.₃(S,Se)₁₈ | — | — |
| Wernerkrauseite | Ca(Fe³⁺,Mn³⁺)₂Mn⁴⁺O₆ | — | — |
| Westerveldite | (Fe,Ni,Co)As | — | — |
| Wicksite | NaCa₂(Fe²⁺,Mn²⁺)₄MgFe³⁺(PO₄)₆ * 2H₂O | — | — |
| Widenmannite | Pb₂(OH)₂[(UO₂)(CO₃)₂] | — | — |
| Wildenauerite | Zn(Fe³⁺,Mn²⁺)₂MnFe³⁺(PO₄)₃(OH)₃(H₂O)₆*₂H₂O | — | — |
| Wilhelmgümbelite | — | — | — |
| Wilhelmramsayite | Cu₃FeS₃*₂H₂O | — | — |
| Wilhelmvierlingite | CaMnFe³⁺(PO₄)₂(OH) * 2H₂O | — | — |
| Willyamite | CoSbS | — | 7.02 g/cm³ |
| Wiperamingaite | NaCaFe³⁺Al(PO₄)F₅(OH)·H₂O | — | — |
| Witherite | BaCO₃ | — | 4.24 g/cm³ |
| Wittichenite | Cu₃BiS₃ | — | — |
| Wooldridgeite | Na₂CaCu²⁺₂(P₂O₇)₂ * 10H₂O | — | — |
| Wrightite | K₂Al₂O(AsO₄)₂ | — | — |