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Orthorhombic crystal system
1,001 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Proto-anthophyllite | ☐Mg₂Mg₅Si₈O₂₂(OH)₂ | — | — |
| Proto-ferro-anthophyllite | ☐Fe²⁺Fe²⁺₅Si₈O₂₂(OH)₂ | — | — |
| Proto-ferro-suenoite | ☐Mn₂²⁺Fe₅²⁺Si₈O₂₂(OH)₂ | 5.5 | — |
| Protoenstatite | Mg₂Si₂O₆ | — | — |
| Proxidecagonite | Al₃₄Ni₉Fe₂ | — | — |
| Pseudobrookite | Fe³⁺₂TiO₅ | 6.0 | — |
| Pseudograndreefite | Pb₆(SO₄)F₁₀ | — | — |
| Pucherite | Bi(VO₄) | 4.0 | 7.07 g/cm³ |
| Putnisite | SrCa₄Cr³⁺₈(CO₃)₈SO₄(OH)₁₆·25H₂O | — | — |
| Příbramite | CuSbSe₂ | — | — |
| Qitianlingite | Fe²⁺₂Nb₂W⁶⁺O₁₀ | — | — |
| Quijarroite | Cu₆HgPb₂Bi₄Se₁₂ | — | — |
| Rabejacite | Ca₂[(UO₂)₄O₄(SO₄)₂](H₂O)₈ | — | — |
| Radtkeite | Hg²⁺₃S₂ICl | — | — |
| Raguinite | TlFeS₂ | — | — |
| Raite | — | 3.0 | — |
| Ramanite-(Rb) | RbB₅O₆(OH)₄·2H₂O | — | — |
| Rammelsbergite | NiAs₂ | — | 7.11 g/cm³ |
| Ramsdellite | Mn⁴⁺O₂ | 3.0 | — |
| Rankamaite | (Na,K)₃(Ta,Nb,Al)₁₁(O,OH)₃₁ | — | — |
| Rapidcreekite | Ca₂(SO₄)(CO₃)·4H₂O | — | — |
| Rasvumite | KFe₂S₃ | — | 3.18 g/cm³ |
| Reddingite | Mn²⁺₃(PO₄)₂·3H₂O | — | — |
| Refikite | C₂₀H₃₂O₂ | — | — |
| Reinerite | Zn₃(As³⁺O₃)₂ | — | — |
| Retzian-(Ce) | Mn²⁺₂Ce(AsO₄)(OH)₄ | — | — |
| Rhodarsenide | Rh₂As | — | — |
| Rhomboclase | (H₅O₂)Fe³⁺(SO₄)₂ * 2H₂O | — | — |
| Rickardite | Cu₃₋ₓTe₂ | — | — |
| Rickturnerite | Pb₇O₄[Mg(OH)₄](OH)Cl₃ | — | — |
| Rietveldite | Fe(UO₂)(SO₄)₂(H₂O)₅ | 2.0 | — |
| Rohaite | (Tl,Pb,K)₂Cu₈.₇Sb₂S₄ | — | — |
| Rollandite | Cu₃(AsO₄)₂ * 4H₂O | — | — |
| Roshchinite | (Ag,Cu)₁₉Pb₁₀Sb₅₁S₉₆ | — | — |
| Rostite | AlSO₄(OH)·5H₂O | — | — |
| Roterbärite | PdCuBiSe₃ | — | 7.23 g/cm³ |
| Roweite | Ca₂Mn²⁺₂B₄O₇(OH)₆ | — | — |
| Rumoiite | AuSn₂ | — | — |
| Rusinovite | Ca₁₀(Si₂O₇)₃Cl₂ | — | — |
| Russellite | Bi₂WO₆ | — | 9.34 g/cm³ |
| Rutherfordine | (UO₂)CO₃ | — | — |
| Sabatierite | Cu₆TlSe₄ | — | — |
| Sachanbińskiite | NaMn₄(Al₅Be)(AlSi₅O₁₈)₂·2H₂O | — | — |
| Safflorite | CoAs₂ | — | 7.55 g/cm³ |
| Salesite | Cu(IO₃)(OH) | — | — |
| Samarskite-(Y) | YFe³⁺Nb₂O₈ | — | — |
| Sampleite | NaCaCu₅(PO₄)₄Cl·5H₂O | 4.0 | — |
| Sanbornite | BaSi₂O₅ | — | 3.73 g/cm³ |
| Sanderite | MgSO₄ * 2H₂O | — | — |
| Santafeite | (Na,Ca,Sr)₁₂(Mn²⁺,Fe³⁺,Al,Mg)₈Mn₄+₈(VO₄)₁₆(OH,O)₂₀ * 8H₂O | — | — |
| Santite | K[B₅O₆(OH)₄] * 2H₂O | — | — |
| Savelievaite | Mg₂Cr³⁺O₂(BO₃) | — | — |
| Sazhinite-(La) | Na₃LaSi₆O₁₅·2H₂O | — | — |
| Sbacchiite | Ca₂AlF₇ | — | — |
| Scenicite | — | — | — |
| Schieffelinite | Pb₁₀Te₆+₆O₂₀(OH)₁₄(SO₄)(H₂O)₅ | — | — |
| Schmidite | — | — | — |
| Schoepite | (UO₂)₈O₂(OH)₁₂ * 12H₂O | 2.5 | — |
| Schuilingite-(Nd) | PbCu(Nd,Gd,Sm,Y)(CO₃)₃(OH) * 1.₅H₂O | — | — |
| Scorodite | Fe³⁺AsO₄·2H₂O | — | — |
| Scottyite | BaCu₂Si₂O₇ | — | — |
| Seamanite | — | — | — |
| Seeligerite | Pb₃(IO₄)Cl₃ | — | — |
| Seifertite | — | — | — |
| Sekaninaite | (Fe,Mg)₂Al₃(AlSi₅O₁₈) | — | — |
| Seligmannite | CuPbAsS₃ | — | 5.24 g/cm³ |
| Senandorite | AgPbSb₃S₆ | — | — |
| Senegalite | Al₂(PO₄)(OH)(OH)₂ * H₂O | 5.5 | — |
| Sepiolite | Mg₄Si₆O₁₅(OH)₂·6H₂O | 2.2 | — |
| Sergeysmirnovite | MgZn₂(PO₄)₂·4H₂O | — | — |
| Shannonite | Pb₂OCO₃ | — | 7.36 g/cm³ |
| Sharpite | — | — | — |
| Sharyginite | — | — | — |
| Shattuckite | — | 3.5 | — |
| Shcherbinaite | V2O5 | — | 3.28 g/cm³ |
| Shilovite | Cu(NH₃)₄(NO₃)₂ | — | — |
| Shinkolobweite | — | — | — |
| Shomiokite-(Y) | Na₃Y(CO₃)₃·3H₂O | — | — |
| Shortite | — | — | — |
| Shosanbetsuite | Ag₃Sn | — | — |