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Triclinic crystal system
516 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Rosenbuschite | Ca₆Zr₂Na₆ZrTi(Si₂O₇)₄(OF)₂F₄ | — | — |
| Rosenhahnite | HCa₃[Si₃O₉(OH)] | — | — |
| Rossiantonite | Al₃(PO₄)(SO₄)₂(OH)₂(H₂O)₁₀·4H₂O | — | — |
| Rossite | Ca(VO₃)₂·4H₂O | — | — |
| Roubaultite | Cu₂(UO₂)₃(CO₃)₂O₂(OH)₂*₄H₂O | — | — |
| Rouseite | Pb₂Mn²⁺[AsO₃]₂ * 2H₂O | — | — |
| Rowlandite-(Y) | (Y,Ce)₄Fe²⁺(Si₂O₇)₂F₂ (?) | — | — |
| Roxbyite | Cu₉S₅ | — | — |
| Roymillerite | Pb₂₄Mg₉(Si₁₀O₂₈)(CO₃)₁₀(BO₃)(SiO₄)(OH)₁₃O₅ | — | 5.97 g/cm³ |
| Rubicline | Rb(AlSi₃O₈) | 6.0 | — |
| Ríosecoite | — | — | — |
| Römerite | — | — | — |
| Saamite | Ba☐TiNbNa₃Ti(Si₂O₇)₂O₂(OH)₂(H₂O)₂ | 3.0 | — |
| Sassolite | B(OH)₃ | 1.0 | 1.65 g/cm³ |
| Scheuchzerite | NaMn²⁺₉Si₉V⁵⁺O₂₈(OH)₄ | — | — |
| Schindlerite | {(NH₄)₄[Na₂(H₂O)₁₀]}{V₁₀O₂₈} | — | — |
| Schizolite | NaCaMnSi₃O₈(OH) | — | — |
| Schneiderhöhnite | — | 3.0 | — |
| Schröckingerite | NaCa₃(UO₂)(SO₄)(CO₃)₃F·10H₂O | 2.5 | — |
| Schüllerite | Ba₂Ti₂Na₂Mg₂(Si₂O₇)₂O₂F₂ | — | — |
| Seaborgite | — | 2.5 | — |
| Sejkoraite-(Y) | Y₂[(UO₂)₈O₆(SO₄)₄(OH)₂]·26H₂O | — | — |
| Selivanovaite | (Na,Ca)₃(Ti,Fe)₅[Si₄O₁₈(OH)₃]*₇H₂O | — | — |
| Serandite | NaMn²⁺₂Si₃O₈(OH) | — | — |
| Serendibite | Ca₄[Mg₆Al₆]O₄[Si₆B₃Al₃O₃₆] | — | — |
| Shenganfuite | PbTe⁴⁺₃O₅(OH)Cl₃(H₂O) | — | — |
| Shinichengite | Ca₅[BSi₂O₇(OH)₂]₂·6H₂O | — | — |
| Siderotil | Fe(SO₄)·5H₂O | — | — |
| Sidpietersite | Pb²⁺₄(S₂O₃)O₂(OH)₂ | — | — |
| Silesiaite | Ca₂Fe³⁺Sn(Si₂O₇)(Si₂O₆OH) | — | — |
| Sinnerite | Cu₆As₄S₉ | — | — |
| Slavkovite | Cu₁₃(AsO₄)₆(AsO₃OH)₄·23H₂O | — | — |
| Smamite | — | — | — |
| Starovaite | KCu₅O(VO₄)₃ | — | — |
| Steedeite | NaMn₂[Si₃BO₉](OH)₂ | — | — |
| Steinmetzite | Zn₂Fe³⁺(PO₄)₂(OH)·3H₂O | — | — |
| Stercorite | — | — | — |
| Stewartite | Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂ * 8H₂O | 3.0 | 2.94 g/cm³ |
| Stranskiite | Zn₂Cu(AsO₄)₂ | 4.0 | 4.73 g/cm³ |
| Stunorthropite | (NH₄)₄[Mo₂O₆(MoO₄)₂] | — | — |
| Sveinbergeite | Ca(Fe²⁺₆Fe³⁺)Ti₂(Si₄O₁₂)₂O₂(OH)₅(H₂O)₄ | — | — |
| Symplesite | Fe²⁺₃(AsO₄)₂ * 8H₂O | — | — |
| Taniajacoite | SrCaMn³⁺₂Si₄O₁₁(OH)₄·2H₂O | — | — |
| Tanohataite | LiMn₂Si₃O₈(OH) | — | — |
| Tantite | Ta₂O₅ | — | — |
| Tarbagataite | (K☐)Ca(Fe,Mn)₇Ti₂(Si₄O₁₂)₂O₂(OH)₅ | — | — |
| Tarbuttite | Zn₂(PO₄)(OH) | — | — |
| Tedhadleyite | Hg²⁺Hg⁺₁₀O₄I₂(Cl,Br)₂ | — | — |
| Thunderbayite | TlAg₃Au₃Sb₇S₆ | 3.0 | 5.69 g/cm³ |
| Tinticite | Fe³⁺₅.₃₄(PO₄)₃.₆₂(VO₄)₀.₃₈(OH)₄·3H₂O | — | — |
| Tinzenite | Ca₆Al₄[B₂Si₈O₃₀](OH)₂ | — | — |
| Tundrite-(Ce) | Na₂Ce₂TiO₂(SiO₄)(CO₃)₂ | 3.0 | — |
| Turanite | Cu₅(VO₄)₂(OH)₄ | — | — |
| Turquoise | CuAl₆(PO₄)₄(OH)₈·4H₂O | — | — |
| Ulexite | NaCaB₅O₆(OH)₆·5H₂O | 2.5 | — |
| Umohoite | (UO₂)(MoO₄)(H₂O)·H₂O | 2.0 | — |
| Uranopilite | (UO₂)₆SO₄O₂(OH)₆·14H₂O | 2.0 | — |
| Ushkovite | MgFe³⁺₂(PO₄)₂(OH)₂·8H₂O | — | — |
| Ussingite | Na₂AlSi₃O₈(OH) | — | 2.42 g/cm³ |
| Utahite | MgCu²⁺₄Zn₂Te⁶⁺₃O1₄(OH)₄(H₂O)₆ | — | — |
| Vakhrushevaite | Mg₅Cr(AlSi₃O₁₀)(OH)₈ | — | — |
| Vallouiseite | Ag₃Tl₂₁.₅PbSb₆₃As₄₁.₅S₁₇₀ | — | — |
| Vandenbrandeite | Cu(UO₂)(OH)₄ | 4.0 | — |
| Vasilyevite | (Hg₂)²⁺₁₀O₆I₃Br₂Cl(CO₃) | — | — |
| Vaughanite | TlHgSb₄S₇ | — | — |
| Vauxite | Fe²⁺Al₂(PO₄)₂(OH)₂·6H₂O | 3.5 | — |
| Veblenite | K₂☐₂Na(Fe²⁺₅Fe³⁺₄Mn₇☐)Nb₃Ti(Si₂O₇)₂(Si₈O₂₂)₂O₆(OH)₁₀(H₂O)₃ | — | — |
| Vigrishinite | Zn₂Ti₄₋ₓ(Si₂O₇)₂O₂(OH,F,O)₂(H₂O,OH,☐)₄ (x<1) | — | — |
| Vistepite | SnMn₄B₂Si₄O₁₆(OH)₂ | — | 3.59 g/cm³ |
| Vittinkiite | MnMn₃MnSi₅O₁₅ | — | — |
| Volkovskite | KCa₄[B₅O₈OH]₄[B(OH)₃]₂Cl * 4H₂O | — | — |
| Vrančiceite | Cu₁₀Hg₃S₈ | — | — |
| Vuonnemite | Na₆Na₂Nb₂Na₃Ti(Si₂O₇)₂(PO₄)₂O₂(OF) | 2.5 | — |
| Vysokýite | U⁴⁺[AsO₂(OH)₂]₄·4H₂O | — | — |
| Wallisite | CuPbTlAs₂S₅ | — | — |
| Walpurgite | (BiO)₄(UO₂)(AsO₄)₂·2H₂O | 3.5 | — |
| Walstromite | BaCa₂(Si₃O₉) | — | — |
| Warikahnite | Zn₃(AsO₄)₂·2H₂O | 2.0 | — |
| Warkite | Ca₂Sc₆Al₆O₂₀ | — | — |
| Wegscheiderite | Na₅H₃(CO₃)₄ | — | 2.40 g/cm³ |