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Orthorhombic crystal system
1,001 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Shulamitite | Ca₃TiFe³⁺AlO₈ | — | — |
| Shuvalovite | K₂(Ca₂Na)(SO₄)₃F | — | — |
| Sicherite | TlAg₂(As,Sb)₃S₆ | — | — |
| Sicklerite | Li₁-x(Mn³⁺xMn²⁺₁-x)PO₄ | — | — |
| Sideronatrite | — | — | — |
| Siidraite | — | — | — |
| Silicocarnotite | Ca₅[(PO₄)(SiO₄)](PO₄) | — | — |
| Sillimanite | Al₂OSiO₄ | 7.0 | 3.68 g/cm³ |
| Simferite | LiMg(PO₄) | — | 2.89 g/cm³ |
| Simonellite | C₁₉H₂₄ | — | — |
| Sinhalite | MgAlBO₄ | — | 3.35 g/cm³ |
| Sinoite | Si₂N₂O | — | — |
| Soddyite | (UO₂)₂SiO₄·2H₂O | 3.5 | — |
| Sofiite | Zn₂(SeO₃)Cl₂ | 2.0 | — |
| Sopcheite | Ag₄Pd₃Te₄ | — | — |
| Spryite | Ag₈(As³⁺₀.₅As⁵⁺₀.₅)S₆ | — | — |
| Srebrodolskite | Ca₂Fe³⁺₂O₅ | — | — |
| Stanleyite | (V⁴⁺O)(SO₄)·6H₂O | — | — |
| Stannoidite | Cu₆⁺Cu₂²⁺(Fe²⁺,Zn)₃Sn₂S₁₂ | — | — |
| Staročeskéite | Ag₀.₇₀Pb₁.₆₀(Bi₁.₃₅Sb₁.₃₅)S₆ | — | — |
| Stefanweissite | (Ca,REE)₂Zr₂(Nb,Ti)(Ti,Nb)₂Fe²⁺O₁₄ | — | — |
| Stellerite | Ca₄(Si₂₈Al₈)O₇₂·28H₂O | — | — |
| Stephanite | Ag₅SbS₄ | — | — |
| Stibiocolumbite | SbNbO₄ | — | 5.62 g/cm³ |
| Stibivanite | Sb₂VO₅ | — | — |
| Stibnite | Sb₂S₃ | 8.0 | — |
| Stokesite | CaSn[Si₃O₉] * 2H₂O | 6.0 | — |
| Strelkinite | Na₂(UO₂)₂(VO₄)₂·6H₂O | — | — |
| Strengite | FePO₄ * 2H₂O | 3.5 | — |
| Stromeyerite | CuAgS | — | — |
| Stronalsite | Na₂SrAl₄Si₄O₁₆ | 6.5 | 2.92 g/cm³ |
| Strontianite | Sr(CO₃) | 3.5 | 3.78 g/cm³ |
| Strontio-orthojoaquinite | (Na,Fe)₂Sr₂Ba₂Ti₂[Si₄O₁₂]₂O₂(O,OH)₂ * H₂O | — | — |
| Strontiodresserite | SrAl₂(CO₃)₂(OH)₄·H₂O | — | — |
| Struvite | H₁₆MgNO₁₀P | 2.0 | — |
| Suenoite | — | — | — |
| Sulfoborite | Mg₃[B(OH)₄]₂(SO₄)(OH,F)₂ | — | — |
| Sulphur | S | — | — |
| Suolunite | Ca₂Si₂O₅(OH)₂(H₂O) | — | — |
| Suredaite | PbSnS₃ | — | — |
| Sussexite | Mn²⁺BO₂(OH) | — | — |
| Sverigeite | NaMnMgSnBe₂(SiO₄)₃(OH) | — | — |
| Svetlanaite | SnSe | — | 5.80 g/cm³ |
| Svornostite-(K) | K₂Mg[(UO₂)(SO₄)₂]₂·8H₂O | — | — |
| Svornostite-(NH₄) | (NH₄)₂Mg(UO₂)₂(SO₄)₄(H₂O)₈ | — | — |
| Svyatoslavite | Ca(Al₂Si₂O₈) | — | — |
| Sweetite | Zn(OH)₂ | — | 3.20 g/cm³ |
| Synchysite-(Nd) | CaNd(CO₃)₂F | — | — |
| Szenicsite | Cu₃MoO₄(OH)₄ | — | — |
| Szklaryite | ☐Al₆BAs³⁺₃O₁₅ | — | — |
| Taimyrite | (Pd,Pt)₉Cu₃Sn₄ | — | — |
| Takéuchiite | Mg₂Mn³⁺O₂(BO₃) | — | — |
| Tancoite | LiNa₂Al(PO₄)(HPO₄)(OH) | — | — |
| Tantalaeschynite-(Ce) | Ce(TiTa)O₆ | — | — |
| Tantalaeschynite-(Y) | Ce(TiTa)O₆ | — | — |
| Tantalite-(Fe) | Fe²⁺Ta₂O₆ | — | — |
| Tantalite-(Mg) | MgTa₂O₆ | — | 7.79 g/cm³ |
| Tantalite-(Mn) | Mn²⁺Ta₂O₆ | — | — |
| Tarapacáite | K₂CrO₄ | — | — |
| Tatarskite | Ca₆Mg₂(SO₄)₂(CO₃)₂(OH)₄Cl₄·7H₂O | — | — |
| Tatyanaite | (Pt,Pd,Cu)₉Cu₃Sn₄ | — | — |
| Tavagnascoite | Bi₄O₄(SO₄)(OH)₂ | — | — |
| Tazzoliite | Ba₂CaSr₀.₅Na₀.₅Ti₂Nb₃SiO₁₇[PO₂(OH)₂]₀.₅ | — | — |
| Teallite | PbSnS₂ | 1.5 | — |
| Telluroperite | Pb₃Te⁴⁺O₄Cl₂ | — | — |
| Temagamite | Pd₃HgTe₃ | — | — |
| Tengchongite | CaO(UO₂)₆(MoO₄)₂O₅·12H₂O | — | — |
| Tengerite-(Y) | Y₂(CO₃)₃·2-3H₂O | — | — |
| Tephroite | Mn²⁺₂SiO₄ | 6.0 | — |
| Terlinguacreekite | Hg²⁺₃Cl₂O₂ | — | — |
| Ternesite | Ca₅(SiO₄)₂(SO₄) | — | — |
| Terranovaite | (Na,Ca)₈(Si₆₈Al₁₂)O₁₆₀·~8H₂O | — | — |
| Teschemacherite | (NH₄)HCO₃ | 1.5 | 1.61 g/cm³ |
| Tewite | K₂(Te₁.₅☐₀.₅)₂W₅O₁₉ | — | — |
| Thadeuite | CaMg₃(PO₄)₂(OH,F)₂ | — | — |
| Theoparacelsite | Cu₃(As₂O₇)(OH)₂ | — | — |
| Thermessaite | K₂AlF₃(SO₄) | — | 2.80 g/cm³ |
| Thermessaite-(NH4) | (NH₄)₂AlF₃(SO₄) | — | — |
| Thermonatrite | Na₂CO₃·H₂O | — | — |
| Thionasilite | Na₂Si₂S₂O₃ | — | — |