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Approved minerals
4,194 minerals
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Johnwalkite | — | Orthorhombic | — | — |
| Joliotite | (UO₂)CO₃·nH₂O | Orthorhombic | — | — |
| Jolliffeite | NiAsSe | Cubic | — | 7.09 g/cm³ |
| Jonassonite | Au(Bi,Pb)₅S₄ | Monoclinic | — | — |
| Jonesite | KBa₂Ti₂(Si₅Al)O₁₈·nH₂O | Orthorhombic | — | — |
| Jonlarsenite | Al₄Cu₉ | Cubic | — | — |
| Joosteite | Mn²⁺Mn³⁺O(PO₄) | Monoclinic | 4.0 | 4.13 g/cm³ |
| Jordanówite | Zr(Ti³⁺Zr)Ti³⁺₄AlO₁₆ | Tetragonal | — | — |
| Joteite | Ca₂CuAl[AsO₄][AsO₃(OH)]₂(OH)₂·5H₂O | Triclinic | — | — |
| Jouravskite | Ca₃Mn₄+(SO₄)(CO₃)(OH)₆·12H₂O | Hexagonal | — | — |
| Joëlbruggerite | Pb₃Zn₃(Sb⁵⁺,Te⁶⁺)As₂O₁₃(OH,O) | Trigonal | — | — |
| Juabite | — | Triclinic | — | — |
| Juangodoyite | Na₂Cu(CO₃)₂ | Monoclinic | — | 2.85 g/cm³ |
| Juanitaite | — | Tetragonal | — | — |
| Juansilvaite | Na₅Al₃[AsO₃(OH)]₄[AsO₂(OH)₂]₂(SO₄)₂·4H₂O | Monoclinic | — | — |
| Jungite | Ca₂Zn₄Fe³⁺₈(PO₄)₉(OH)₉·16H₂O | Orthorhombic | 1.0 | — |
| Junitoite | CaZn₂Si₂O₇·H₂O | Orthorhombic | 4.5 | — |
| Junoite | Cu₂Pb₃Bi₈(S,Se)₁₆ | Monoclinic | — | — |
| Juonniite | — | Orthorhombic | — | — |
| Jurbanite | AlSO₄(OH)·5H₂O | Monoclinic | — | — |
| Juxingite | Bi₆Cu₁₄₀Fe₃₀S₁₂₅ | Cubic | — | — |
| Jáchymovite | — | Monoclinic | — | — |
| Jôkokuite | — | Triclinic | — | — |
| Jörgkellerite | — | Trigonal | — | — |
| Jørgensenite | Na₂Sr₁₄Na₂Al₁₂F₆₄(OH)₄ | Monoclinic | — | — |
| Kaatialaite | Fe(H₂AsO₄)₃ * 5H₂O | Monoclinic | — | — |
| Kadyrelite | [(Hg¹⁺)₂]₃OBr₃(OH) | Cubic | — | — |
| Kahlenbergite | KAl₁₁O₁₇ | Hexagonal | — | — |
| Kainotropite | Cu₄Fe³⁺O₂(V₂O₇)(VO₄) | Orthorhombic | — | — |
| Kaitianite | Ti³⁺₂Ti₄+O₅ | Monoclinic | — | — |
| Kalborsite | K₆Al₄BSi₆O₂₀(OH)₄Cl | Tetragonal | — | — |
| Kalgoorlieite | As₂Te₃ | Monoclinic | — | 5.77 g/cm³ |
| Kalifersite | (K,Na)₅Fe³⁺₇Si₂₀O₅₀(OH)₆ * 12H₂O | — | — | — |
| Kalininite | ZnCr₂S₄ | Cubic | — | 3.95 g/cm³ |
| Kaliochalcite | KCu₂(SO₄)₂[(OH)(H₂O)] | Monoclinic | 4.0 | 3.49 g/cm³ |
| Kalistrontite | K₂Sr(SO₄)₂ | Trigonal | — | — |
| Kalithallite | K₃Tl³⁺Cl₆*₂H₂O | Tetragonal | — | — |
| Kalungaite | PdAsSe | Cubic | — | 7.46 g/cm³ |
| Kalyuzhnyite-(Ce) | NaKCaSrCeTi(Si₈O₂₁)OF(H₂O)₃ | Monoclinic | — | — |
| Kamaishilite | Ca₂(Al₂SiO₆)(OH)₂ | Tetragonal | — | — |
| Kamarizaite | Fe³⁺₃(AsO₄)₂(OH)₃·3H₂O | Triclinic | — | — |
| Kambaldaite | NaNi₄(CO₃)₃(OH)₃ * 3H₂O | Hexagonal | — | — |
| Kamchatkite | KCu₃(SO₄)₂OCl | Orthorhombic | 3.5 | — |
| Kamenevite | K₂TiSi₃O₉*H₂O | Orthorhombic | — | — |
| Kamiokite | Fe₂Mo₃O₈ | Hexagonal | — | — |
| Kampelite | Ba₆Mg₃Sc₈(PO₄)₁₂(OH)₆*₇H₂O | Orthorhombic | — | — |
| Kampfite | Ba₁₂(Si₁₁Al₅)O₃₁(CO₃)₈Cl₅ | Monoclinic | 3.0 | — |
| Kamphaugite-(Y) | Ca(Y,REE)(CO₃)₂(OH) * H₂O | Tetragonal | — | — |
| Kanatzidisite | (SbBiS₃)₂Te₂ | Monoclinic | — | — |
| Kanemite | HNaSi₂O₅ * 3H₂O | — | — | — |
| Kangite | (Sc,Ti,Al,Zr,Mg,Ca,☐)₂O₃ | Cubic | — | — |
| Kannanite | Ca₄Al₄(AlMg)(VO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆ | Orthorhombic | — | — |
| Kanoite | Mn²⁺(Mg,Mn²⁺)Si₂O₆ | Monoclinic | — | — |
| Kanonaite | Mn³⁺AlOSiO₄ | — | — | — |
| Kanonerovite | Na₃Mn²⁺(P₃O₁₀) * 12H₂O | Monoclinic | — | — |
| Kantorite | K₂NaMg(SO₄)₂F | Orthorhombic | — | — |
| Kaolinite | Al₂Si₂O₅(OH)₄ | Triclinic | 1.0 | — |
| Kapellasite | Cu₃Zn(OH)₆Cl₂ | Trigonal | — | — |
| Kapitsaite-(Y) | (Ba,K,Pb)₄(Y,Ca)₂Si₈(B,Si)₄O₂₈F | Triclinic | — | — |
| Kapundaite | CaNaFe³⁺₄(PO₄)₄(OH)₃·5H₂O | Triclinic | — | — |
| Kapustinite | Na₅(Na,Mn²⁺)<₁Zr(H₂Si₆O₁₈) | Monoclinic | — | — |
| Karasugite | SrCa[Al(F,OH)₇] | Monoclinic | — | — |
| Karchevskyite | Mg₁₈Al₉(OH)₅₄Sr₂(CO₃)₉(H₂O)₆(H₃O)₅ | Trigonal | — | — |
| Karelianite | V³⁺₂O₃ | Trigonal | — | — |
| Karenwebberite | NaFe²⁺(PO₄) | Orthorhombic | — | — |
| Karibibite | Fe³⁺₃(As³⁺O₂)₄(As³⁺₂O₅)(OH) | Orthorhombic | — | — |
| Karlite | Mg₇(BO₃)₃(OH,Cl)₅ | Orthorhombic | 5.5 | — |
| Karlleuite | Ca₂MnO₄ | Tetragonal | — | — |
| Karlseifertite | Pb(Ga₂Ge)(AsO₄)₂(OH)₆ | Trigonal | — | — |
| Karpenkoite | Co₃(V₂O₇)(OH)₂·2H₂O | Trigonal | — | — |
| Karpovite | Tl₂VO(SO₄)₂(H₂O) | Monoclinic | — | — |
| Karupmøllerite-Ca | — | — | — | — |
| Karwowskiite | Ca₉Mg(Fe²⁺₀,₅◻₀,₅)(PO₄)₇ | Trigonal | — | 3.08 g/cm³ |
| Kasatkinite | Ba₂Ca₈B₅Si₈O₃₂(OH)₃·6H₂O | Monoclinic | — | — |
| Kashinite | (Ir,Rh)₂S₃ | — | — | — |
| Kaskasite | (Mo,Nb)S₂·(Mg₁₋ₓAlₓ)(OH)₂₊ₓ | Trigonal | — | — |
| Kasolite | Pb(UO₂)SiO₄·H₂O | Monoclinic | — | — |
| Kassite | CaTi₂O₄(OH)₂ | Monoclinic | 5.0 | 3.23 g/cm³ |
| Kastningite | (Mn²⁺,Fe²⁺,Mg)Al₂(PO₄)₂(OH)₂·8H₂O | — | — | — |
| Katanite | Ba₃NbFe₃Si₂O₁₄ | Trigonal | — | — |