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- Orthorhombic
Orthorhombic crystal system
1,001 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Orthocuproplatinum | Pt₃Cu | — | — |
| Orthogersdorffite | NiAsS | — | 6.02 g/cm³ |
| Orthojoaquinite-(Ce) | NaBa₂Ce₂FeTi₂[Si₄O₁₂]₂O₂(O,OH)·H₂O | — | — |
| Orthojoaquinite-(La) | NaBa₂La₂Fe²⁺Ti₂[Si₄O₁₂]₂O₂(O,OH)·H₂O | — | — |
| Orthominasragrite | (V⁴⁺O)(SO₄)·5H₂O | — | — |
| Orthopinakiolite | Mg₂Mn³⁺O₂(BO₃) | — | — |
| Orthoserpierite | Ca(Cu,Zn)₄(SO₄)₂(OH)₆·3H₂O | — | — |
| Orthowalpurgite | (BiO)₄(UO₂)(AsO₄)₂·2H₂O | — | — |
| Oscarkempffite | Ag₁₀Pb₄(Sb₁₇Bi₉)S₄₈ | — | — |
| Ottemannite | Sn₂S₃ | — | — |
| Otwayite | Ni₂(CO₃)(OH)₂·H₂O | — | — |
| Overite | CaMgAl(PO₄)₂(OH)·4H₂O | — | — |
| Oxammite | (NH₄)₂(C₂O₄)·H₂O | 2.5 | 1.50 g/cm³ |
| Oxycalciopyrochlore | Ca₂Nb₂O₆O | 5.0 | 4.41 g/cm³ |
| Oyelite | Ca₁₀Si₈B₂O₂₉ * 12.₅H₂O | — | — |
| Ozerovaite | Na₂KAl₃(AsO₄)₄ | — | — |
| Pabellóndepicaite | Cu²⁺₂(N₃C₂H₂)₂(NH₃)₂(NO₃)Cl·2H₂O | — | — |
| Palermoite | Li₂SrAl₄(PO₄)₄(OH)₄ | — | — |
| Palladobismutharsenide | Pd₂(As,Bi) | 5.0 | 10.80 g/cm³ |
| Palladodymite | Pd₂As | 5.5 | 10.14 g/cm³ |
| Panguite | (Ti,Al,Sc,Mg,Zr,Ca)₁.₈O₃ | — | — |
| Pansnerite | K₃Na₃(Fe³⁺,Al)₆(AsO₄)₈ | — | — |
| Paolovite | Pd₂Sn | 4.5 | 10.88 g/cm³ |
| Papikeite | NaMg₂(Mg₃Al₂)(Si₅Al₃)O₂₂(OH)₂ | — | — |
| Paradimorphite | As₄S₃ | — | — |
| Paralaurionite | PbCl(OH) | — | — |
| Pararammelsbergite | NiAs₂ | — | 7.11 g/cm³ |
| Pararsenolamprite | (As,Sb) | — | — |
| Paraschachnerite | Ag₃Hg₂ | — | — |
| Paratimroseite | Pb₂Cu₄(TeO₆)₂(H₂O)₂ | — | — |
| Paratooite-(La) | (La,Ca,Na,Sr)₆Cu(CO₃)₈ | — | — |
| Pauflerite | VO(SO₄) | — | 3.32 g/cm³ |
| Paulgrothite | — | — | — |
| Paulkerrite | [(H₂O)K]Mg₂(Fe³⁺₂Ti)(PO₄)₄(OF)(H₂O)₁₀·4H₂O | — | — |
| Pautovite | CsFe₂S₃ | — | 3.61 g/cm³ |
| Pavlovskyite | Ca₈(SiO₄)₂(Si₃O₁₀) | — | — |
| Pašavaite | Pd₃Pb₂Te₂ | — | 9.56 g/cm³ |
| Peatite-(Y) | Li₄Na₁₂(Y,Na,Ca,REE)₁₂(PO₄)₁₂(CO₃)₄(F,OH)₈ | — | — |
| Pekovite | SrB₂Si₂O₈ | — | 3.26 g/cm³ |
| Penkvilksite | Na₄Ti₂Si₈O₂₂ * 4H₂O | — | — |
| Pentagonite | Ca(VO)Si₄O₁₀ * 4H₂O | — | — |
| Perettiite-(Y) | Y₂Mn₄FeSi₂B₈O₂₄ | — | — |
| Perite | PbBiO₂Cl | — | — |
| Perovskite | CaTiO₃ | 5.5 | 4.00 g/cm³ |
| Perroudite | Hg₅Ag₄S₅(I,Br)₂Cl₂ | — | — |
| Pertsevite-(F) | Mg₂(BO₃)(F,OH) | — | — |
| Pertsevite-(OH) | Mg₂(BO₃)(OH) | — | — |
| Peterbaylissite | (Hg+₂)₁.₅(CO₃)(OH) * 2H₂O | — | — |
| Petermegawite | — | — | — |
| Petrukite | (Cu,Ag)₂(Fe,Zn)(Sn,In)S₄ | — | — |
| Petterdite | PbCr₂(CO₃)₂(OH)₄·H₂O | 2.0 | — |
| Petříčekite | — | — | — |
| Phosinaite-(Ce) | Na₁₃Ca₂(Ce,La,Th,Nd,Pr)(Si₄O₁₂)(PO₄)₄ | — | — |
| Phosphoferrite | (Fe²⁺,Mn²⁺)₃(PO₄)₂ * 3H₂O | — | — |
| Phosphuranylite | KCa(H₃O)₃(UO₂)₇(PO₄)₄O₄·8H₂O | 2.5 | — |
| Phylloretine | C₁₈H₁₈ | — | — |
| Piccoliite | NaCaMn³⁺₂(AsO₄)₂O(OH) | — | — |
| Picotpaulite | TlFe₂S₃ | 2.0 | 5.20 g/cm³ |
| Piilonenite-(Nd) | NaNd(CO₃)₂(H₂O)₃ | — | — |
| Pinalite | Pb₃(WO₄)OCl₂ | — | — |
| Pinchite | Hg₅O₄Cl₂ | — | — |
| Pingguite | Bi₆Te₄+₂O₁₃ | — | — |
| Pirssonite | Na₂Ca(CO₃)₂·2H₂O | — | — |
| Plancheite | Cu₈(Si₈O₂₂)(OH)₄·H₂O | — | — |
| Pleysteinite | [(H₂O)K]Mn₂Al₃(PO₄)₄F₂(H₂O)₁₀·4H₂O | — | — |
| Plimerite | ZnFe³⁺₄(PO₄)₃(OH)₅ | — | — |
| Plumbogaidonnayite | PbZrSi₃O₉·2H₂O | — | — |
| Plumbogottlobite | PbMg(VO₄)(OH) | — | — |
| Plumbophyllite | Pb₂Si₄O₁₀·H₂O | — | — |
| Plumboselite | Pb₃O₂(SeO₃) | — | 7.81 g/cm³ |
| Plumbotsumite | Pb₁₃(CO₃)₆(Si₁₀O₂₇)·3H₂O | — | — |
| Plumosite | Pb₂Sb₂S₅ | — | — |
| Podlesnoite | Ca₂Ba(CO₃)₂F₂ | — | — |
| Polarite | Pd(Bi,Pb) | — | — |
| Postite | Mg(H₂O)₆Al₂(OH)₂(H₂O)₈(V₁₀O₂₈)·13H₂O | — | — |
| Pratesiite | AgCuTe₂ | 3.0 | 10.15 g/cm³ |
| Prehnite | — | — | — |
| Preobrazhenskite | Mg₃B₁₁O₁₅(OH)₉ | — | — |
| Prewittite | KPb₁.₅ZnCu₆O₂(SeO₃)₂Cl₁₀ | — | — |
| Prismatine | (☐,Fe,Mg)(Mg,Al,Fe)₅Al₄Si₂(Si,Al)₂(B,Si,Al)(O,OH,F)₂₂ | — | — |