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Triclinic crystal system
516 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Millosevichite | Al₂(SO₄)₃ | — | 2.86 g/cm³ |
| Minnesotaite | Fe²⁺₃Si₄O₁₀(OH)₂ | — | — |
| Mitryaevaite | Al₆(PO₄)((P,S)O₃(OH,O))₂F₂(OH)₂ * 14.₅H₂O | — | — |
| Moiraite | Pb₁₂Sb₈As₈S₃₆ | — | — |
| Molinelloite | Cu(H₂O)(OH)V₄+O(V₅+O₄) | — | — |
| Monetite | Ca(HPO₄) | — | 2.95 g/cm³ |
| Montebrasite | LiAlPO₄(OH) | — | — |
| Montpelvouxite | AgPb₁₆Sb₂₇As₁₈S₈₄ | — | — |
| Montroyalite | Sr₄Al₈(CO₃)₃(OH,F)₂₆ * 10-₁₁H₂O | — | — |
| Morleyite | Ag₂CuPb₂₅Sb₂₄As₄S₆₈.₅ | — | — |
| Murakamiite | Ca₂LiSi₃O₈(OH) | — | — |
| Murmanite | Na₂Ti₂Na₂Ti₂(Si₂O₇)O₄(H₂O)₄ | — | — |
| Nabateaite | Fe₂P₂O₇ | — | 3.69 g/cm³ |
| Nacaphite | Na₂Ca(PO₄)F | — | 2.79 g/cm³ |
| Nalivkinite | Li₂NaFe²⁺₇Ti₂Si₈O₂₆(OH)₄F | — | — |
| Namibite | Cu(BiO)₂(VO₄)(OH) | — | — |
| Nealite | Pb₄Fe(AsO₃)₂Cl₄·2H₂O | 4.0 | — |
| Nickeltalmessite | Ca₂Ni(AsO₄)₂·2H₂O | — | — |
| Nolzeite | NaMn₂[Si₃BO₉](OH)₂·2H₂O | — | — |
| Nordgauite | MnAl₂(PO₄)₂(F,OH)₂·5.5H₂O | — | — |
| Nybergite | Ca₄Sc₃Sn(Si₂O₇)(Si₂O₆OH)₃ | — | — |
| Okenite | Ca₁₀Si₁₈O₄₆·18H₂O | — | — |
| Okieite | Mg₃[V₁₀O₂₈]·28H₂O | — | — |
| Olshanskyite | Ca₂[B₃O₃(OH)₆]OH·3H₂O | — | — |
| Ondrušite | CaCu₄(AsO₄)₂(AsO₃OH)₂·10H₂O | — | — |
| Ophirite | Ca₂Mg₄[Zn₂Mn³⁺₂(H₂O)₂(Fe³⁺W₉O₃₄)₂]·46H₂O | — | — |
| Oppenheimerite | Na₂(UO₂)(SO₄)₂·3H₂O | — | — |
| Osakaite | Zn₄(SO₄)(OH)₆·5H₂O | — | — |
| Otjisumeite | PbGe₄O₉ | 3.0 | 5.77 g/cm³ |
| Ottohahnite | Na₆(UO₂)₂(SO₄)₅(H₂O)₇·1.5H₂O | — | — |
| Packratite | Ca₁₁(H₂O)₅₉(As³⁺V⁵⁺₁₀V⁴⁺₂As⁵⁺₆O₅₁)₂∙24H₂O | — | — |
| Paganoite | NiBi(AsO₄)O | — | 6.76 g/cm³ |
| Paraershovite | Na₃K₃Fe³⁺₂(Si₄O₁₀OH)₂(OH)₂(H₂O)₄ | — | — |
| Parakeldyshite | Na₂ZrSi₂O₇ | — | 3.24 g/cm³ |
| Paravauxite | Fe²⁺Al₂(PO₄)₂(OH)₂ * 8H₂O | 3.0 | — |
| Parsonsite | Pb₂(UO₂)(PO₄)₂·(0-2)H₂O | — | — |
| Pattersonite | PbFe₃(PO₄)₂(OH)₅·H₂O | — | — |
| Patynite | — | — | — |
| Pauladamsite | Cu₄(SeO₃)(SO₄)(OH)₄·2H₂O | — | — |
| Pectolite | NaCa₂Si₃O₈(OH) | — | 2.78 g/cm³ |
| Pendevilleite-(Y) | Mg₂Y₃Al(UO₂)₂(CO₃)₇(OH)₆(H₂O)₁₆ | — | — |
| Pentahydrite | MgSO₄·5H₂O | 2.5 | 1.76 g/cm³ |
| Pentahydroborite | CaB₂O(OH)₆ * 2H₂O | — | — |
| Philoxenite | (K,Na,Pb)₄(Na,Ca)₂(Mg,Cu)₃(Fe³⁺₀.₅Al₀.₅)(SO₄)₈ | — | — |
| Phosphoinnelite | Na₃Ba₄Ti₃Si₄O₁₄(PO₄)₂O₂F | — | — |
| Picropharmacolite | Ca₄Mg(AsO₃OH)₂(AsO₄)₂·11H₂O | — | — |
| Planerite | Al₆(PO₄)₂(PO₃OH)₂(OH)₈·4H₂O | 5.0 | — |
| Poitevinite | (Cu,Fe)SO₄ * H₂O | — | — |
| Pokhodyashinite | — | — | — |
| Polyhalite | K₂Ca₂Mg(SO₄)₄·2H₂O | 3.5 | — |
| Polyphite | Na₆(Na₄Ca₂)₂Na₂Ti₂Na₂Ti₂(Si₂O₇)₂(PO₄)₆O₄F₄ | — | — |
| Pomite | — | — | — |
| Popovite | Cu₅O₂(AsO₄)₂ | — | — |
| Pringleite | Ca₉B₂₆O₃₄(OH)₂₄Cl₄ * 13H₂O | — | — |
| Protocaseyite | — | — | — |
| Protochabournéite | Tl₂Pb(Sb,As)₁₀S₁₇ | — | — |
| Pseudojohannite | Cu₃(OH)₂[(UO₂)₄(SO₄)₂]* 12H₂O | — | — |
| Pseudopomite | — | — | — |
| Pyrophyllite | Al₂Si₄O₁₀(OH)₂ | — | — |
| Pyroxferroite | (Fe,Mn,Ca)SiO₃ | — | — |
| Pyroxmangite | MnSiO₃ | — | — |
| Péligotite | — | — | — |
| Quadruphite | Na₆Na₂(CaNa)₂Na₂Ti₂Na₂Ti₂(Si₂O₇)₂(PO₄)₄O₄F₂ | — | — |
| Quenstedtite | Fe₂(SO₄)₃·11H₂O | 2.5 | — |
| Raberite | Tl₅Ag₄As₆SbS₁₅ | — | — |
| Ramikite-(Y) | Li₄(Na,Ca)₁₂(Y,Ca,REE)₆Zr₆(PO₄)₁₂(CO₃)₄O₄[(OH),F]₄ | — | — |
| Rappoldite | PbCo₂(AsO₄)₂·2H₂O | 4.5 | 5.28 g/cm³ |
| Rasmussenite | Ca(C₂H₃O₃)₂·3H₂O | — | — |
| Rauchite | Ni(UO₂)₂(AsO₄)₂·10H₂O | — | — |
| Raudseppite | Ba₂Ca₇(Si₃O₉)₂(CO₃)₂Cl₂ | — | — |
| Raydemarkite | — | — | — |
| Raygrantite | Pb₁₀Zn(SO₄)₆(SiO₄)₂(OH)₂ | — | — |
| Reaphookhillite | MgZn₂(PO₄)₂·4H₂O | — | — |
| Reedmergnerite | NaBSi₃O₈ | 6.3 | 2.78 g/cm³ |
| Reynoldsite | Pb₂Mn⁴⁺₂O₅(CrO₄) | — | — |
| Rheniite | ReS₂ | — | 7.11 g/cm³ |
| Rhodonite | CaMn₃Mn(Si₅O₁₅) | — | — |
| Rhönite | — | — | — |
| Riotintoite | Al(SO₄)(OH)*₃H₂O | — | — |
| Rodalquilarite | Fe₂(TeO₂OH)₃(TeO₃)Cl | — | — |