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- Orthorhombic
Orthorhombic crystal system
1,001 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Chenguodaite | Ag₉FeTe₂S₄ | — | — |
| Chenmingite | FeCr₂O₄ | — | 4.77 g/cm³ |
| Cheremnykhite | Pb₃Zn₃(VO₄)₂(TeO₆) | — | 5.99 g/cm³ |
| Cherepanovite | RhAs | — | — |
| Chesnokovite | Na₂SiO₂(OH)₂·8H₂O | — | — |
| Chessexite | Na₄Ca₂Mg₃Al₈(SiO₄)₂(SO₄)₁₀(OH)₁₀·40H₂O | — | — |
| Chesterite | Mg₁₇Si₂₀O₅₄(OH)₆ | — | — |
| Chestermanite | Mg₂(Fe³⁺,Mg,Al,Sb⁵⁺)O₂(BO₃) | — | — |
| Chiappinoite-(Y) | Y₂Mn(Si₃O₇)₄ | — | — |
| Childrenite | Fe²⁺AlPO₄(OH)₂·H₂O | 5.0 | — |
| Chivruaiite | Ca₄(Ti,Nb)₅(Si₆O₁₇)₂(OH,O)₅·13-14H₂O | — | — |
| Chlorocalcite | KCaCl₃ | — | — |
| Chlorothionite | K₂Cu(SO₄)Cl₂ | — | — |
| Chromschieffelinite | Pb₁₀Te⁶⁺₆O₂₀(OH)₁₄(CrO₄)(H₂O)₅ | — | — |
| Chromviskontite | Pb₅Cu₂(CrO₄)₃(SeO₃)(OH)₆ | — | — |
| Chrysoberyl | BeAl₂O₄ | 8.5 | 3.71 g/cm³ |
| Chrysocolla | Cu₂₋ₓAlₓ(H₂₋ₓSi₂O₅)(OH)₄ · nH₂O | — | — |
| Chrysotile | Mg₃Si₂O₅(OH)₄ | — | 2.49 g/cm³ |
| Chukochenite | — | 8.0 | — |
| Clerite | MnSb₂S₄ | — | — |
| Cobaltaustinite | CaCo(AsO₄)(OH) | — | — |
| Cobaltite | CoAsS | 5.5 | 6.26 g/cm³ |
| Cohenite | Fe₃C | — | — |
| Colimaite | K₃VS₄ | — | 2.21 g/cm³ |
| Columbite-(Fe) | Fe²⁺Nb₂O₆ | — | — |
| Columbite-(Mg) | MgNb₂O₆ | — | 4.89 g/cm³ |
| Columbite-(Mn) | Mn²⁺Nb₂O₆ | — | — |
| Comancheite | Hg²⁺₅₅N³⁻₂₄(NH₂,OH)₄(Cl,Br)₃₄ | — | — |
| Compreignacite | K₂(UO₂)₆O₄(OH)₆·7H₂O | — | — |
| Conichalcite | CaCuAsO₄(OH) | 4.5 | — |
| Coparsite | Cu₄(AsO₄,VO₄)O₂Cl | — | — |
| Cordierite | Mg₂Al₄Si₅O₁₈ | — | 2.42 g/cm³ |
| Cornetite | Cu₃PO₄(OH)₃ | — | — |
| Correianevesite | Fe²⁺Mn²⁺₂(PO₄)₂·3H₂O | — | — |
| Cortesognoite | CaV₂Si₂O₇(OH)₂·H₂O | — | — |
| Cosalite | Pb₂Bi₂S₅ | — | — |
| Cotunnite | PbCl₂ | 2.5 | 5.77 g/cm³ |
| Cowlesite | Ca(Al₂Si₃)O₁₀·(5-6)H₂O | 5.0 | — |
| Creaseyite | Cu₂Pb₂Fe³⁺₂Si₅O₁₇·6H₂O | — | — |
| Crimsonite | PbFe³⁺₂(PO₄)₂(OH)₂ | — | — |
| Crocobelonite | — | — | — |
| Cubanite | CuFe₂S₃ | 3.5 | — |
| Cupalite | CuAl | — | 5.51 g/cm³ |
| Cupromolybdite | Cu²⁺₃O(Mo⁶⁺O₄)₂ | — | — |
| Cuprosenandorite | Ag₁₆Cu₈Pb₂₄Sb₇₂S₁₄₄ | — | — |
| Curienite | Pb(UO₂)₂(VO₄)₂·5H₂O | 3.0 | — |
| Curite | Pb₃(UO₂)₈O₈(OH)₆ * 3H₂O | — | — |
| Cyanotrichite | Cu₄Al₂SO₄(OH)₁₂·2H₂O | 2.0 | — |
| Czochralskiite | Na₄Ca₃Mg(PO₄)₄ | — | — |
| Damaraite | Pb₃O₂(OH)Cl | — | — |
| Danburite | CaB₂Si₂O₈ | — | — |
| Danielsite | (Cu,Ag)₁₄HgS₈ | — | — |
| Daomanite | CuPtAsS₂ | — | 7.39 g/cm³ |
| Dawsonite | NaAl(CO₃)(OH)₂ | 3.0 | 2.48 g/cm³ |
| Defernite | Ca₆(CO₃)₂-x(SiO₄)x(OH)₇(Cl,OH)₁-₂x (x<₀.₅) | — | — |
| Delchiaroite | Cu₃I(CH₃S)₂ | — | — |
| Deliensite | Fe²⁺(UO₂)₂(SO₄)₂(OH)₂·7H₂O | — | — |
| Deltanitrogen | N | — | — |
| Demagistrisite | BaCa₂Mn³⁺₄(Si₃O₁₀)(Si₂O₇)(OH)₄·3H₂O | — | — |
| Demicheleite-(Br) | BiSBr | — | 6.21 g/cm³ |
| Demicheleite-(Cl) | BiSCl | — | 5.65 g/cm³ |
| Demicheleite-(I) | BiSI | — | — |
| Descloizite | PbZn(VO₄)(OH) | — | 6.21 g/cm³ |
| Diaspore | AlO(OH) | — | 3.41 g/cm³ |
| Dimorphite | As₄S₃ | — | — |
| Dinite | C₂₀H₃₆ | 1.0 | — |
| Direnzoite | NaK₆MgCa₂(Al₁₃Si₄₇)O₁₂₀·36H₂O | — | — |
| Dmitryvarlamovite | Ti₂(Fe³⁺Nb)O₈ | — | — |
| Donpeacorite | (Mn²⁺,Mg)MgSi₂O₆₂ | — | 3.36 g/cm³ |
| Dovyrenite | Ca₆Zr(Si₂O₇)₂(OH)₄ | — | — |
| Dresserite | Ba₂Al₄(CO₃)₄(OH)₈·3H₂O | — | — |
| Dreyerite | Bi(VO₄) | — | 7.07 g/cm³ |
| Duftite | PbCuAsO₄(OH) | 4.5 | — |
| Dumortierite | AlAl₆BSi₃O₁₈ | — | — |
| Dundasite | PbAl₂(CO₃)₂(OH)₄·H₂O | 2.0 | — |
| Duranusite | As₄S | — | — |
| Dyrnaesite-(La) | Na₈Ce⁴⁺(La,REE)₂(PO₄)₆ | — | — |
| Dyscrasite | Ag₃₊ₓSb₁₋ₓ (x~0.2) | — | — |
| Edenharterite | PbTlAs₃S₆ | — | — |
| Edingtonite | Ba(Si₃Al₂)O₁₀·4H₂O | — | — |