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Monoclinic crystal system
1,774 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Julgoldite-(Fe2+) | Ca₂Fe²⁺Fe³⁺₂(Si₂O₇)(SiO₄)(OH)₂·H₂O | — | — |
| Julgoldite-(Fe3+) | — | — | — |
| Julgoldite-(Mg) | Ca₂MgFe³⁺₂(Si₂O₇)(SiO₄)(OH)₂·H₂O | — | — |
| Julienite | Na₂[Co(SCN)₄]·8H₂O | — | — |
| Junoite | Cu₂Pb₃Bi₈(S,Se)₁₆ | — | — |
| Jurbanite | AlSO₄(OH)·5H₂O | — | — |
| Jáchymovite | — | — | — |
| Jørgensenite | Na₂Sr₁₄Na₂Al₁₂F₆₄(OH)₄ | — | — |
| Kaatialaite | Fe(H₂AsO₄)₃ * 5H₂O | — | — |
| Kaersutite | NaCa₂(Mg₃AlTi)(Si₆Al₂)O₂₂O₂ | — | — |
| Kainite | KMg(SO₄)Cl·3H₂O | — | 2.10 g/cm³ |
| Kaitianite | Ti³⁺₂Ti₄+O₅ | — | — |
| Kalgoorlieite | As₂Te₃ | — | 5.77 g/cm³ |
| Kaliborite | HKMg₂B₁₂O₁₆(OH)₁₀·4H₂O | — | — |
| Kalicinite | KHCO₃ | — | 2.23 g/cm³ |
| Kalinite | KAl(SO₄)₂·11H₂O | — | — |
| Kaliochalcite | KCu₂(SO₄)₂[(OH)(H₂O)] | 4.0 | 3.49 g/cm³ |
| Kalyuzhnyite-(Ce) | NaKCaSrCeTi(Si₈O₂₁)OF(H₂O)₃ | — | — |
| Kamotoite-(Y) | Y₂(UO₂)₄(CO₃)₃O₄ * 14H₂O | — | — |
| Kampfite | Ba₁₂(Si₁₁Al₅)O₃₁(CO₃)₈Cl₅ | 3.0 | — |
| Kanatzidisite | (SbBiS₃)₂Te₂ | — | — |
| Kanoite | Mn²⁺(Mg,Mn²⁺)Si₂O₆ | — | — |
| Kanonerovite | Na₃Mn²⁺(P₃O₁₀) * 12H₂O | — | — |
| Kapustinite | Na₅(Na,Mn²⁺)<₁Zr(H₂Si₆O₁₈) | — | — |
| Karasugite | SrCa[Al(F,OH)₇] | — | — |
| Karpovite | Tl₂VO(SO₄)₂(H₂O) | — | — |
| Kasatkinite | Ba₂Ca₈B₅Si₈O₃₂(OH)₃·6H₂O | — | — |
| Kasolite | Pb(UO₂)SiO₄·H₂O | — | — |
| Kassite | CaTi₂O₄(OH)₂ | 5.0 | 3.23 g/cm³ |
| Katayamalite | KLi₃Ca₇Ti₂(SiO₃)₁₂(OH)₂ | — | — |
| Katerinopoulosite | (NH₄)₂Zn(SO₄)₂*₆H₂O | — | — |
| Katophorite | Na(NaCa)(Mg₄Al)(Si₇Al)O₂₂(OH)₂ | — | — |
| Katsarosite | Zn(C₂O₄)⋅2H₂O | — | — |
| Kayupovaite | Na₂Mn₁₀[(Si₁₄Al₂)O₃₈(OH)₈]·₇H₂O | — | — |
| Keckite | CaMn(Fe³⁺,Mn)₂Fe³⁺₂(PO₄)₄(OH)₃(H₂O)₇ | — | — |
| Keiviite-(Y) | Y₂Si₂O₇ | — | 4.26 g/cm³ |
| Keiviite-(Yb) | Yb₂Si₂O₇ | — | 6.24 g/cm³ |
| Kelyanite | (Hg+₂)₆Sb³⁺BrCl₂O₆ | — | — |
| Kenngottite | Mn²⁺₃Fe³⁺₄(PO₄)₄(OH)₆(H₂O)₂ | — | — |
| Kenyaite | Na₂Si₂₂O₄₁(OH)₈ * 6H₂O | — | — |
| Kernite | Na₂B₄O₆(OH)₂·3H₂O | — | — |
| Kernowite | — | — | — |
| Kesebolite-(Ce) | — | — | — |
| Khaidarkanite | Cu₄Al₃(OH)₁₄F₃·2H₂O | — | — |
| Khibinskite | K₂ZrSi₂O₇ | — | 3.19 g/cm³ |
| Khorixasite | (Bi₀.₆₇☐₀.₃₃)Cu(VO₄)(OH) | — | — |
| Khrenovite | Na₃Fe³⁺₂(AsO₄)₃ | — | — |
| Khristovite-(Ce) | {CaCe}{MgAlMn²⁺}(Si₂O₇)(SiO₄)(OH)F | — | — |
| Khurayyimite | Ca₇Zn₄(Si₂O₇)₂(OH)₁₀*₄H₂O | — | — |
| Kidwellite | NaFe³⁺₉₊ₓ(PO₄)₆(OH)₁₁·3H₂O (x ≈ 0.33) | 3.0 | 3.34 g/cm³ |
| Kieserite | Mg(SO₄)(H₂O) | 3.5 | — |
| Killalaite | Ca₆.₄(H₀.₆Si₂O₇)₂(OH)₂ | — | — |
| Kingstonite | (Rh,Ir,Pt)₃S₄ | 6.0 | — |
| Kinoite | Ca₂Cu₂Si₃O₁₀·2H₂O | 2.5 | — |
| Kipushite | (Cu,Zn)₅Zn(PO₄)₂(OH)₆ * H₂O | — | — |
| Kiryuite | NaMnAl(PO₄)F₃ | — | — |
| Kladnoite | C₆H₄(CO)₂NH | — | — |
| Klaprothite | Na₆(UO₂)(SO₄)₄·4H₂O | — | — |
| Kleberite | FeTi₈O₁₁(OH)₅ | — | — |
| Kleemanite | ZnAl₂(PO₄)₂(OH)₂·3H₂O | — | — |
| Klyuchevskite | K₃Cu₃(Fe³⁺,Al)(SO₄)₄O₂ | — | — |
| Kogarkoite | Na₃SO₄F | 3.5 | 2.58 g/cm³ |
| Koktaite | (NH₄)₂Ca(SO₄)₂ * H₂O | — | — |
| Kolbeckite | ScPO₄·2H₂O | — | — |
| Kolfanite | Ca₂Fe³⁺₃O₂(AsO₄)₃·2H₂O | — | — |
| Kolitschite | Pb[Zn₀.₅,☐₀.₅]Fe₃(AsO₄)₂(OH)₆ | — | — |
| Kombatite | Pb₁₄(VO₄)₂O₉Cl₄ | — | — |
| Kononovite | NaMg(SO₄)F | — | 2.80 g/cm³ |
| Koragoite | (Mn²⁺,Fe³⁺)₃(Nb,Ta,Ti)₂(Nb,Mn)₂(W,Ta)₂O₂₀ | — | — |
| Kornelite | Fe₂(SO₄)₃ * 7H₂O | — | — |
| Korzhinskite | Ca(B₂O₄) * H₂O | — | — |
| Kosmochlor | NaCrSi₂O₆ | 6.0 | 3.60 g/cm³ |
| Kostylevite | K₂Zr(Si₃O₉) * H₂O | — | — |
| Krausite | KFe(SO₄)₂ * H₂O | — | — |
| Kreiterite | CsLi₂Fe³⁺(Si₄O₁₀)F₂ | — | — |
| Krettnichite | PbMn³⁺₂(VO₄)₂(OH)₂ | — | — |
| Kristekite | Cu₂(H₂O)₄(UO₂)(SeO₃)₃·4H₂O | — | — |
| Kristjánite | KNa₂H(SO₄)₂ | — | — |
| Krotite | CaAl₂O₄ | 6.5 | — |
| Krupičkaite | — | — | — |