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Grandfathered minerals
1,125 minerals
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Pinakiolite | (Mg,Mn)₂(Mn³⁺,Sb⁵⁺)O₂(BO₃) | Monoclinic | 6.0 | — |
| Pinnoite | MgB₂O(OH)₆ | Tetragonal | — | — |
| Plagionite | Pb₅Sb₈S₁₇ | Monoclinic | 2.5 | — |
| Platinum (native) | Pt | Cubic | — | — |
| Plattnerite | PbO₂ | Tetragonal | 5.5 | 9.34 g/cm³ |
| Polydymite | Ni²⁺Ni³⁺₂S₄ | Cubic | — | — |
| Polyhalite | K₂Ca₂Mg(SO₄)₄·2H₂O | Triclinic | 3.5 | — |
| Portlandite | Ca(OH)₂ | Trigonal | 2.0 | 2.30 g/cm³ |
| Potarite | PdHg | Tetragonal | — | 14.41 g/cm³ |
| Powellite | CaMoO₄ | Tetragonal | — | 4.27 g/cm³ |
| Prehnite | — | Orthorhombic | — | — |
| Preobrazhenskite | Mg₃B₁₁O₁₅(OH)₉ | Orthorhombic | — | — |
| Priceite | Ca₂B₅O₇(OH)₅·H₂O | Monoclinic | — | — |
| Priderite | K(Ti⁴⁺₇Fe³⁺)O₁₆ | — | — | — |
| Probertite | NaCaB₅O₇(OH)₄·3H₂O | Monoclinic | — | — |
| Prosopite | CaAl₂(F,OH)₈ | Monoclinic | 4.5 | — |
| Proustite | Ag₃AsS₃ | Trigonal | — | 5.39 g/cm³ |
| Pseudolaueite | Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂ * 8H₂O | — | — | — |
| Pseudomalachite | Cu₅(PO₄)₂(OH)₄ | Monoclinic | — | — |
| Pucherite | Bi(VO₄) | Orthorhombic | 4.0 | 7.07 g/cm³ |
| Purpurite | Mn³⁺(PO₄) | — | — | — |
| Pyrargyrite | Ag₃SbS₃ | Trigonal | 2.8 | 5.80 g/cm³ |
| Pyrite | FeS₂ | Cubic | 6.0 | 5.03 g/cm³ |
| Pyrobelonite | PbMn²⁺(VO₄)(OH) | — | — | — |
| Pyrochroite | Mn²⁺(OH)₂ | Trigonal | — | — |
| Pyromorphite | Pb₅(PO₄)₃Cl | Hexagonal | — | — |
| Pyrope | Mg₃Al₂(SiO₄)₃ | Cubic | 7.5 | 3.75 g/cm³ |
| Pyrophanite | Mn²⁺TiO₃ | Trigonal | — | — |
| Pyrophyllite | Al₂Si₄O₁₀(OH)₂ | Triclinic | — | — |
| Pyrostilpnite | Ag₃SbS₃ | Monoclinic | — | 5.80 g/cm³ |
| Pyroxmangite | MnSiO₃ | Triclinic | — | — |
| Pyrrhotite | Fe₇S₈ | Hexagonal | 4.0 | — |
| Quenselite | PbMn³⁺O₂(OH) | Monoclinic | 2.5 | — |
| Quenstedtite | Fe₂(SO₄)₃·11H₂O | Triclinic | 2.5 | — |
| Rabbittite | Ca₃Mg₃(UO₂)₂(CO₃)₆(OH)₄·18H₂O | Monoclinic | 2.5 | — |
| Ramdohrite | Pb₅.₉Fe₀.₁Mn₀.₁In₀.₁Cd₀.₂Ag₂.₈Sb₁₀.₈S₂₄ | Monoclinic | 2.0 | — |
| Rammelsbergite | NiAs₂ | Orthorhombic | — | 7.11 g/cm³ |
| Ramsdellite | Mn⁴⁺O₂ | Orthorhombic | 3.0 | — |
| Ranciéite | (Ca,Mn²⁺)₀.₂(Mn⁴⁺,Mn³⁺)O₂·0.6H₂O | Trigonal | — | — |
| Rankinite | Ca₃Si₂O₇ | Monoclinic | — | — |
| Ransomite | CuFe₂(SO₄)₄ * 6H₂O | Monoclinic | — | — |
| Raspite | PbWO₄ | Tetragonal | — | 8.32 g/cm³ |
| Rathite | Ag₂Pb₁₂₋ₓTlₓ/₂As₁₈₊ₓ/₂S₄₀ | — | 3.0 | — |
| Realgar | AsS | Monoclinic | — | 3.26 g/cm³ |
| Refikite | C₂₀H₃₂O₂ | Orthorhombic | — | — |
| Reinerite | Zn₃(As³⁺O₃)₂ | Orthorhombic | — | — |
| Retgersite | NiSO₄ * 6H₂O | Tetragonal | — | — |
| Reyerite | Na₂Ca₁₄Al₂Si₂₂O₅₈(OH)₈·6H₂O | — | — | — |
| Rhodesite | KHCa₂Si₈O₁₉·5H₂O | — | — | — |
| Rhodizite | KBe₄Al₄(B₁₁Be)O₂₈ | Cubic | — | — |
| Rhomboclase | (H₅O₂)Fe³⁺(SO₄)₂ * 2H₂O | Orthorhombic | — | — |
| Richetite | (Fe³⁺,Mg)Pb ₈.₆(UO₂)₃₆O₃₆(OH)₂₄*₄₁H₂O | — | — | — |
| Rickardite | Cu₃₋ₓTe₂ | Orthorhombic | — | — |
| Rinneite | K³NaFe²⁺Cl₆ | — | 3.0 | 2.35 g/cm³ |
| Robinsonite | Pb₄Sb₆S₁₃ | Monoclinic | — | — |
| Rockbridgeite | Fe²⁺Fe³⁺₄(PO₄)₃(OH)₅ | — | — | — |
| Roeblingite | Ca₆Mn²⁺Pb₂(Si₃O₉)₂(SO₄)₂(OH)₂·4H₂O | Monoclinic | — | — |
| Rooseveltite | BiAsO₄ | Tetragonal | — | 7.62 g/cm³ |
| Rosasite | CuZnCO₃(OH)₂ | Monoclinic | 4.5 | — |
| Roscherite | Ca₂Mn²⁺₅Be₄(PO₄)₆(OH)₄ * 6H₂O | — | — | — |
| Roselite | Ca₂Co(AsO₄)₂·2H₂O | Monoclinic | 3.5 | — |
| Rosickýite | S | Monoclinic | — | — |
| Rossite | Ca(VO₃)₂·4H₂O | Triclinic | — | — |
| Roweite | Ca₂Mn²⁺₂B₄O₇(OH)₆ | Orthorhombic | — | — |
| Russellite | Bi₂WO₆ | Orthorhombic | — | 9.34 g/cm³ |
| Rutile | TiO₂ | Tetragonal | — | 3.86 g/cm³ |
| Römerite | — | Triclinic | — | — |
| Sabugalite | HAl(UO₂)₄(PO₄)₄·16H₂O | Monoclinic | 2.5 | — |
| Safflorite | CoAs₂ | Orthorhombic | — | 7.55 g/cm³ |
| Sahlinite | Pb₁₄(AsO₄)₂O₉Cl₄ | Monoclinic | — | — |
| Salesite | Cu(IO₃)(OH) | Orthorhombic | — | — |
| Saléeite | Mg(UO₂)₂(PO₄)₂·10H₂O | Monoclinic | — | — |
| Sampleite | NaCaCu₅(PO₄)₄Cl·5H₂O | Orthorhombic | 4.0 | — |
| Samsonite | Ag₄MnSb₂S₆ | Monoclinic | — | — |
| Sanbornite | BaSi₂O₅ | Orthorhombic | — | 3.73 g/cm³ |
| Sanderite | MgSO₄ * 2H₂O | Orthorhombic | — | — |
| Sanidine | KAlSi₃O₈ | Monoclinic | 6.0 | 2.46 g/cm³ |
| Sanmartinite | ZnWO₄ | Monoclinic | 5.0 | — |
| Santafeite | (Na,Ca,Sr)₁₂(Mn²⁺,Fe³⁺,Al,Mg)₈Mn₄+₈(VO₄)₁₆(OH,O)₂₀ * 8H₂O | Orthorhombic | — | — |
| Saponite | Ca₀.₂₅(Mg,Fe)₃((Si,Al)₄O₁₀)(OH)₂ * nH₂O | Monoclinic | — | — |