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Monoclinic crystal system
1,774 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Tuperssuatsiaite | Na₂Fe₃Si₈O₂₀(OH)₂·4H₂O | — | — |
| Tuzlaite | NaCaB₅O₈(OH)₂·3H₂O | — | — |
| Tvalchrelidzeite | Hg₃SbAsS₃ | — | — |
| Tvrdýite | Fe²⁺Fe³⁺₂Al₃(PO₄)₄(OH)₅(H₂O)₄·2H₂O | — | — |
| Tweddillite | CaSr(Mn³⁺₂Al)[Si₂O₇][SiO₄]O(OH) | — | — |
| Tyrolite | Ca₂Cu₉(AsO₄)₄(CO₃)(OH)₈·11H₂O | 2.0 | — |
| Törnebohmite-(Ce) | Ce₂Al(SiO₄)₂(OH) | — | — |
| Uedaite-(Ce) | Mn²⁺CeAl₂Fe²⁺(Si₂O₇)(SiO₄)O(OH) | — | — |
| Uklonskovite | NaMg(SO₄)F·2H₂O | — | — |
| Ulfanderssonite-(Ce) | (Ce₁₅Ca)∑₁₆Mg₂(SiO₄)₁₀(SiO₃OH)(OH,F)₅Cl₃ | — | — |
| Ulrichite | CaCu(UO₂)(PO₄)₂·4H₂O | — | — |
| Upalite | Al(UO₂)₃(PO₄)₂O(OH)·7H₂O | — | — |
| Uralborite | CaB₂O₂(OH)₄ | — | — |
| Uralolite | Ca₂Be₄(PO₄)₃(OH)₃·5H₂O | — | — |
| Uranoclite | (UO₂)₂(OH)₂Cl₂(H₂O)₄ | — | — |
| Uranophane | Ca(UO₂)₂(SiO₃OH)₂·5H₂O | — | — |
| Uranosphaerite | Bi(UO₂)O₂(OH) | — | — |
| Uricite | C₅H₄N₄O₃ | — | — |
| Uroxite | [(UO₂)₂(C₂O₄)(OH)₂(H₂O)₂]·H₂O | — | — |
| Urusovite | CuAlO(AsO₄) | — | — |
| Usovite | Ba₂CaMgAl₂F₁₄ | — | 4.05 g/cm³ |
| Uzonite | As₄S₅ | — | — |
| Vajdakite | (Mo⁶⁺O₂)₂As³⁺₂O₅·3H₂O | — | — |
| Vanadio-pargasite | NaCa₂(Mg³⁺₄V)(Si₆Al₂)O₂₂(OH)₂ | — | — |
| Vanadoakasakaite-(Ce) | CaCe(V³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH) | — | — |
| Vanadoakasakaite-(La) | (CaLa)(V³⁺AlMn²⁺)O[Si₂O₇][SiO₄](OH) | — | — |
| Vanadoallanite-(La) | CaLa³⁺V³⁺AlFe²⁺(Si₂O₇)(SiO₄)O(OH) | — | — |
| Vanadoandrosite-(Ce) | MnCe(V³⁺AlMn²⁺)[Si₂O₇][SiO₄]O(OH) | — | — |
| Vanadoandrosite-(La) | Mn²⁺La(V³⁺AlMn²⁺)(Si₂O₇)(SiO₄)O(OH) | — | — |
| Vanadomalayaite | CaVO(SiO₄) | — | — |
| Vanalite | NaAl₈V₁₀O₃₈·30H₂O | — | — |
| Vanarsite | NaCa₁₂(H₂O)₆₄(As³⁺V⁵⁺₈.₅V⁴⁺₃.₅As⁵⁺₆O₅₁)₂·14H₂O | 2.0 | — |
| Vanderheydenite | Zn₆(PO₄)₂(SO₄)(OH)₄·7H₂O | — | — |
| Vandermeerscheite | K₂[(UO₂)₂V₂O₈]·2H₂O | — | — |
| Vaniniite | Ca₂Mn²⁺₃Mn³⁺₂O₂(AsO₄)₄·2H₂O | — | — |
| Vanpeltite | (Mo₂O₅)(S⁴⁺O₃)·4H₂O | — | — |
| Vanthoffite | Na₆Mg(SO₄)₄ | — | 2.77 g/cm³ |
| Vanuralite | Al(UO₂)₂(VO₄)₂(OH)·8.5H₂O | 2.0 | — |
| Vapnikite | Ca₂CaUO₆ | 5.0 | 4.93 g/cm³ |
| Vargite | Cu₂Mn₃(AsO₄)₂(OH)₄(H₂O)₄ | — | — |
| Varulite | Na₂Mn(MnFe³⁺)(PO₄)₃ | — | — |
| Vasilseverginite | Cu₉O₄(AsO₄)₂(SO₄)₂ | — | — |
| Vauquelinite | CuPb₂(CrO₄)(PO₄)(OH) | — | — |
| Veatchite | Sr₂B₁₁O₁₆(OH)₅ * H₂O | — | — |
| Vendidaite | Al₂(SO₄)(OH)₃Cl·6H₂O | — | — |
| Vermiculite | Mg₀.₇(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ * 8H₂O | 1.3 | 2.55 g/cm³ |
| Vertumnite | Ca₄Al₄Si₄O₆(OH)₂₄ * 3H₂O | — | — |
| Vestaite | (Ti₄+Fe²⁺)Ti₄+₃O₉ | — | — |
| Viaeneite | (Fe,Pb)₄S₈O | — | — |
| Vielleaureite-(Ce) | (Mn²⁺Ce)(MgAlMn²⁺)F[Si₂O₇][SiO₄](OH) | — | — |
| Viitaniemiite | Na(Ca,Mn²⁺)Al(PO₄)(F,OH)₃ | — | — |
| Vikingite | Ag₅Pb₈Bi₁₃S₃₀ | 3.5 | — |
| Villyaellenite | MnMn₂Ca₂(AsO₄)₂(HAsO₄)₂ * 4H₂O | — | — |
| Vimsite | CaB₂O₂(OH)₄ | — | — |
| Vinogradovite | Na₄Ti₄(Si₂O₆)₂[(Si,Al)₄O₁₀]O₄ * (H₂O,Na,K)₃ | — | — |
| Virgilite | LiAlSi₂O₆ | — | — |
| Virgilluethite | MoO₃·H₂O | — | — |
| Vitimite | Ca₆[B₁₄O₁₉](SO₄)(OH)₁₄ * 5H₂O | — | — |
| Vivianite | Fe²⁺₃(PO₄)₂·8H₂O | — | — |
| Vladimirite | Ca₄(AsO₄)₂(AsO₃OH) * 4H₂O | — | — |
| Vladkuzminite | K₄CuZn₃(AsO₄)₄ | — | — |
| Vladykinite | Na₃Sr₄(Fe²⁺Fe³⁺)Si₈O₂₄ | — | — |
| Vlasovite | Na₂ZrSi₄O₁₁ | — | 2.88 g/cm³ |
| Voggite | Na₂Zr(PO₄)(CO₃)(OH) * 2H₂O | — | — |
| Voglite | Ca₂Cu(UO₂)(CO₃)₄·6H₂O | — | — |
| Volaschioite | Fe₄(SO₄)O₂(OH)₆·2H₂O | — | — |
| Volborthite | Cu₃V₂O₇(OH)₂·2H₂O | 3.5 | — |
| Voloshinite | Rb(LiAl₁.₅☐₀.₅)(Al₀.₅Si₃.₅)O₁₀F₂ | — | — |
| Vonbezingite | Ca₆Cu₃(SO₄)₃(OH)₁₂ * 2H₂O | 4.0 | — |
| Voudourisite | Cd(SO₄)·H₂O | — | — |
| Vránaite | — | — | — |
| Vyuntspakhkite-(Y) | (Y,Yb)₄Al₂.₅-₁.₅(Si,Al)₁.₅-₂.₅(SiO₄)₄O(OH)₇ | — | — |
| Västmanlandite-(Ce) | — | — | — |
| Väyrynenite | Mn²⁺Be(PO₄)OH | 5.0 | — |
| Vésigniéite | — | — | — |
| Wagnerite | Mg₂PO₄F | — | 3.02 g/cm³ |
| Waipouaite | — | — | — |
| Wairakite | Ca(Si₄Al₂)O₁₂·2H₂O | — | — |
| Wampenite | C₁₈H₁₆ | — | — |
| Wangkuirenite | Pb₃Cl₂(SeO₃)₂ | — | — |