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Monoclinic crystal system
1,774 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Strontioginorite | CaSrB₁₄O₂₀(OH)₆ * 5H₂O | — | — |
| Strontiohurlbutite | SrBe₂(PO₄)₂ | — | 3.15 g/cm³ |
| Strontiojoaquinite | Sr₂Ba₂(Na,Fe)₂Ti₂[Si₄O₁₂]₂O₂(O,OH)₂ * H₂O | — | — |
| Strontioperloffite | SrMn²⁺₂Fe³⁺₂(PO₄)₃(OH)₃ | — | — |
| Strontioruizite | Sr₂Mn³⁺₂Si₄O₁₁(OH)₄·2H₂O | — | — |
| Studenitsite | NaCa₂[B₉O₁₄(OH)₄] * 2H₂O | — | — |
| Suanite | Mg₂[B₂O₅] | — | — |
| Sugarwhiteite | Pb₂Te₅O₁₂ | — | — |
| Suhailite | (NH₄)Fe²⁺₃(Si₃Al)O₁₀(OH)₂ | 2.5 | — |
| Sulfatoredmondite | — | — | — |
| Sundiusite | Pb₁₀(SO₄)O₈Cl₂ | — | — |
| Sunshuite | FeBi₂S₄ | — | — |
| Surkhobite | KBa₃Ca₂Na₂Mn₁₆Ti₈(Si₂O₇)₈O₈(OH)₄(F,O,OH)₈ | — | — |
| Sursassite | Mn²⁺₂Al₃(SiO₄)(Si₂O₇)(OH)₃ | — | — |
| Sveite | KAl₇(NO₃)₄(OH)₁₆Cl₂ * 8H₂O | — | — |
| Swamboite-(Nd) | Nd₀.₃₃₃[(UO₂)(SiO₃OH)](H₂O)\\sim₂.₅ | 2.5 | — |
| Swartzite | MgCa(UO₂)(CO₃)₃ * 12H₂O | — | — |
| Switzerite | Mn²⁺₃(PO₄)₂ * 7H₂O | — | — |
| Sylvanite | AgAuTe₄ | 1.8 | 8.10 g/cm³ |
| Synchysite-(Ce) | CaCe(CO₃)₂F | — | — |
| Syngenite | K₂Ca(SO₄)₂·H₂O | 2.5 | — |
| Szaibélyite | MgBO₂(OH) | — | 2.66 g/cm³ |
| Szmikite | Mn(SO₄)(H₂O) | — | — |
| Szomolnokite | Fe²⁺SO₄·H₂O | — | — |
| Tacharanite | Ca₁₂Al₂Si₁₈O₃₃(OH)₃₆ | — | — |
| Tainiolite | KLiMg₂Si₄O₁₀F₂ | — | — |
| Takanawaite-(Y) | YTaO₄ | — | 7.52 g/cm³ |
| Tamaite | (Ca,K,Ba,Na)₃-₄Mn₂₄(Si,Al)₄₀(O,OH)₁₁₂·nH₂O | — | — |
| Tamarugite | NaAl(SO₄)₂·6H₂O | — | — |
| Tamboite | Fe³⁺₃(OH)(H₂O)₂(SO₄)(Te₄+O₃)₃(Te₄+O(OH)₂)(H₂O)₃ | — | — |
| Tangdanite | Ca₂Cu₉(AsO₄)₄(SO₄)₀.₅(OH)₉·9H₂O | — | — |
| Tapiaite | Ca₅Al₂(AsO₄)₄(OH)₄·12H₂O | — | — |
| Taramite | NaCaNa(Mg₃Al₂)Al₂Si₆O₂₂(OH)₂ | — | — |
| Tarutinoite | Ag₃Pb₇Bi₇S₁₉ | — | — |
| Tashelgite | CaMgFe²⁺Al₉O₁₆(OH) | — | — |
| Tazieffite | Pb₂₀Cd₂(As,Bi)₂₂S₅₀Cl₁₀ | — | — |
| Telluromandarinoite | Fe³⁺₂(Te⁴⁺O₃)₃·6H₂O | — | — |
| Telluropalladinite | Pd₉Te₄ | — | 10.27 g/cm³ |
| Tenorite | CuO | 3.5 | 6.30 g/cm³ |
| Terlinguaite | Hg₂OCl | — | — |
| Ternovite | MgNb₄O₁₁·8-12H₂O | — | — |
| Terrywallaceite | AgPb(Sb,Bi)₃S₆ | — | — |
| Teruggite | Ca₄Mg[AsB₆O₁₁(OH)₆]₂(H₂O)₁₂·2H₂O | 2.5 | — |
| Tetrataenite | FeNi | — | 8.54 g/cm³ |
| Thalénite-(Y) | Y₃Si₃O₁₀F | — | — |
| Thebaite-(NH4) | — | — | — |
| Therasiaite | (NH₄)₃KNa₂Fe²⁺Fe³⁺(SO₄)₃Cl₅ | — | — |
| Thomasclarkite-(Y) | (Na,Ce)(Y,REE)(HCO₃)(OH)₃·4H₂O | — | — |
| Thomsenolite | NaCaAlF₆·H₂O | 2.0 | — |
| Thorneite | Pb₆(Te₂O₁₀)(CO₃)Cl₂(H₂O) | — | — |
| Thortveitite | Sc₂Si₂O₇ | — | 3.37 g/cm³ |
| Tikhonenkovite | SrAlF₄(OH)(H₂O)₂ | — | — |
| Tilasite | CaMg(AsO₄)F | — | 3.63 g/cm³ |
| Tilleyite | Ca₅Si₂O₇(CO₃)₂ | — | — |
| Tinnunculite | C₅H₄N₄O₃·2H₂O | — | — |
| Tinsleyite | KAl₂(PO₄)₂(OH)(H₂O)₂ | — | — |
| Tiragalloite | Mn²⁺₄As₅+Si₃O₁₂(OH) | — | — |
| Tissintite | (Ca,Na,☐)AlSi₂O₆ | — | — |
| Titanite | CaTiSiO₅ | 5.5 | 3.42 g/cm³ |
| Tlapallite | (Ca,Pb)₃CaCu₆[Te₄+₃Te₆+O₁₂]₂(Te₄+O₃)₂(SO₄)₂·3H₂O | — | — |
| Todorokite | (Na,Ca,K,Ba,Sr)₁-x(Mn,Mg,Al)₆O₁₂·3-4H₂O | — | — |
| Tokyoite | Ba₂Mn³⁺(VO₄)₂(OH) | — | — |
| Tolbachite | CuCl₂ | — | 3.26 g/cm³ |
| Tomcampbellite | [KCl][Fe²⁺₁₄(OH)₆(PO₄)₆(PO₃OH)₂] | — | — |
| Torreyite | — | — | — |
| Trabzonite | Ca₄(Si₃O₉)(OH)₂ | — | — |
| Treasurite | Ag₇Pb₆Bi₁₅S₃₀ | — | — |
| Trebiskyite | Na₃Mg₂[TiV₉O₂₈]·22H₂O | — | — |
| Tremolite | ☐Ca₂Mg₅Si₈O₂₂(OH)₂ | — | — |
| Trimerite | CaBe₃Mn²⁺₂(SiO₄)₃ | — | — |
| Trimounsite-(Y) | Y₂Ti₂(SiO₄)O₅ | — | — |
| Triplite | Mn²⁺₂PO₄F | — | — |
| Trolleite | Al₄(PO₄)₃(OH)₃ | — | — |
| Trona | Na₃(HCO₃)(CO₃)·2H₂O | — | — |
| Tschermakite | ☐Ca₂(Mg₃Al₂)Si₆Al₂O₂₂(OH)₂ | 5.5 | — |
| Tsepinite-Sr | (Sr,Ba,K)(Ti,Nb)₂(Si₄O₁₂)(OH,O)₂·3H₂O | — | — |
| Tsumcorite | PbZn₂(AsO₄)₂·2H₂O | 4.5 | — |
| Tubulite | Ag₂Pb₂₂Sb₂₀S₅₃ | — | — |
| Tumchaite | Na₂Zr(Si₄O₁₁)·2H₂O | — | — |
| Tunellite | SrB₆O₉(OH)₂·3H₂O | — | — |