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Grandfathered minerals
1,125 minerals
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Häggite | V₂O₂(OH)₃ | Monoclinic | 4.5 | — |
| Hörnesite | Mg₃(AsO₄)₂·8H₂O | — | 1.0 | — |
| Hübnerite | Mn²⁺WO₄ | Monoclinic | — | — |
| Ianthinite | U⁴⁺₂(UO₂)₄O₆(OH)₄·9H₂O | Orthorhombic | — | — |
| Ice | H₂O | Hexagonal | 1.5 | 0.92 g/cm³ |
| Idaite | Cu₃FeS₄ | — | — | — |
| Idrialite | C₂₂H₁₄ | Orthorhombic | — | — |
| Ilesite | (Mn,Zn,Fe)SO₄·4H₂O | Monoclinic | — | — |
| Ilmenite | Fe²⁺Ti⁴⁺O₃ | Trigonal | 5.5 | 4.72 g/cm³ |
| Ilvaite | CaFe³⁺Fe²⁺₂(Si₂O₇)O(OH) | Orthorhombic | — | — |
| Inderborite | CaMg[B₃O₃(OH)₅]₂(H₂O)₄·2H₂O | Monoclinic | — | — |
| Indialite | Mg₂Al₃(AlSi₅O₁₈) | Hexagonal | — | 2.42 g/cm³ |
| Inesite | Ca₂(Mn,Fe)₇Si₁₀O₂₈(OH)₂·5H₂O | Triclinic | — | — |
| Inyoite | CaB₃O₃(OH)₅(H₂O)₃·H₂O | Monoclinic | 2.0 | — |
| Iriginite | (UO₂)Mo₂O₇·3H₂O | Orthorhombic | — | — |
| Isokite | CaMg(PO₄)F | — | — | — |
| Jagoite | Pb₁₈Fe³⁺₄[Si₄(Si,Fe³⁺)₆][Pb₄Si₁₆(Si,Fe)₄]O₈₂Cl₆ | Hexagonal | — | — |
| Jalpaite | Ag₃CuS₂ | Tetragonal | — | — |
| Jamesonite | Pb₄FeSb₆S₁₄ | Monoclinic | 2.5 | — |
| Jarlite | Na₂(Sr,Na)₁₄Mg₂Al₁₂F₆₄(OH,H₂O)₄ | Monoclinic | — | — |
| Jeremejevite | Al₆(BO₃)₅F₃ | Hexagonal | — | 3.18 g/cm³ |
| Johannite | Cu(UO₂)₂(SO₄)₂(OH)₂·8H₂O | Triclinic | 2.0 | — |
| Jordanite | Pb₁₄(As,Sb)₆S₂₃ | Monoclinic | — | — |
| Jordisite | MoS₂ | Amorphous | — | 4.67 g/cm³ |
| Kahlerite | Fe(UO₂)₂(AsO₄)₂ * 12H₂O | — | — | — |
| Kainite | KMg(SO₄)Cl·3H₂O | Monoclinic | — | 2.10 g/cm³ |
| Kaliborite | HKMg₂B₁₂O₁₆(OH)₁₀·4H₂O | Monoclinic | — | — |
| Kalicinite | KHCO₃ | Monoclinic | — | 2.23 g/cm³ |
| Kaliophilite | KAlSiO₄ | Hexagonal | — | 2.54 g/cm³ |
| Kalsilite | KAlSiO₄ | Hexagonal | — | 2.54 g/cm³ |
| Katoptrite | (Mn²⁺,Mg)₁₃(Al,Fe³⁺)₄Sb₅+₂(SiO₄)₂O₂₀ | — | — | — |
| Kempite | Mn²⁺₂Cl(OH)₃ | — | — | — |
| Kentrolite | Pb₂Mn³⁺₂(Si₂O₇)O₂ | Orthorhombic | — | — |
| Kermesite | Sb₂OS₂ | Triclinic | — | 4.68 g/cm³ |
| Kernite | Na₂B₄O₆(OH)₂·3H₂O | Monoclinic | — | — |
| Kettnerite | CaBiCO₃OF | Orthorhombic | — | — |
| Kilchoanite | Ca₆(SiO₄)(Si₃O₁₀) | Orthorhombic | — | — |
| Kingite | Al₃(PO₄)₂F₂(OH) · 7H₂O | Triclinic | — | — |
| Kirschsteinite | CaFe²⁺SiO₄ | Orthorhombic | — | — |
| Kladnoite | C₆H₄(CO)₂NH | Monoclinic | — | — |
| Kleinite | (Hg₂N)(Cl,SO₄)·nH₂O | Hexagonal | — | — |
| Klockmannite | CuSe | Hexagonal | — | 6.04 g/cm³ |
| Kobellite | Pb₁₁(Cu,Fe)₂(Bi,Sb)₁₅S₃₅ | Orthorhombic | — | — |
| Koechlinite | Bi₂MoO₆ | Orthorhombic | — | 8.14 g/cm³ |
| Koenenite | Na₄Mg₉Al₄Cl₁₂(OH)₂₂ | Trigonal | — | — |
| Koktaite | (NH₄)₂Ca(SO₄)₂ * H₂O | Monoclinic | — | — |
| Koninckite | Fe³⁺PO₄ * 3H₂O | Tetragonal | — | — |
| Kornelite | Fe₂(SO₄)₃ * 7H₂O | Monoclinic | — | — |
| Kornerupine | Mg₃Al₆(Si,Al,B)₅O₂₁(OH) | Orthorhombic | — | — |
| Kotoite | Mg₃(BO₃)₂ | Orthorhombic | 6.5 | 3.11 g/cm³ |
| Koutekite | Cu₅As₂ | Hexagonal | — | — |
| Kratochvílite | C₁₃H₁₀ | Orthorhombic | — | — |
| Krausite | KFe(SO₄)₂ * H₂O | Monoclinic | — | — |
| Kremersite | (NH₄)₂Fe³⁺Cl₅·H₂O | — | — | — |
| Krennerite | Au₃AgTe₈ | Orthorhombic | — | — |
| Kribergite | Al₅(PO₄)₃(SO₄)(OH)₄ * 4H₂O | Triclinic | — | — |
| Kryzhanovskite | (Fe³⁺,Mn²⁺)₃(PO₄)₂(OH,H₂O)₃ | — | — | — |
| Kröhnkite | Na₂Cu(SO₄)₂·2H₂O | Monoclinic | — | — |
| Ktenasite | (Cu,Zn)₅(SO₄)₂(OH)₆·6H₂O | Monoclinic | — | — |
| Kupletskite | (K,Na)₃(Mn,Fe)₇Ti₂Si₈O₂₆(OH)₄F | — | — | — |
| Kurnakovite | Mg[B₃O₃(OH)₅](H₂O)₄·H₂O | Triclinic | — | — |
| Kutnohorite | CaMn²⁺(CO₃)₂ | Trigonal | — | — |
| Kësterite | Cu₂ZnSnS₄ | Tetragonal | 4.5 | 4.61 g/cm³ |
| Köttigite | Zn₃(AsO₄)₂·8H₂O | — | — | — |
| Lacroixite | NaAl(PO₄)F | Monoclinic | — | — |
| Lanarkite | Pb₂O(SO₄) | Monoclinic | — | 6.98 g/cm³ |
| Langbeinite | K₂Mg₂(SO₄)₃ | Cubic | — | 2.84 g/cm³ |
| Langite | Cu₄SO₄(OH)₆·2H₂O | Monoclinic | — | — |
| Lansfordite | MgCO₃·5H₂O | Monoclinic | — | — |
| Larderellite | NH₄B₅O₇(OH)₂·H₂O | Monoclinic | — | — |
| Larnite | Ca₂SiO₄ | Monoclinic | 6.0 | 2.96 g/cm³ |
| Larsenite | PbZnSiO₄ | Orthorhombic | — | 5.83 g/cm³ |
| Latiumite | (Ca,K)₄(Si,Al)₅O₁₁(SO₄,CO₃) | — | — | — |
| Laueite | Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂ * 8H₂O | Triclinic | 3.0 | — |
| Laurionite | PbCl(OH) | Orthorhombic | — | — |
| Laurite | RuS₂ | Cubic | — | 6.15 g/cm³ |
| Lausenite | Fe₂(SO₄)₃*₅H₂O | Monoclinic | — | — |
| Lautarite | Ca(IO₃)₂ | Monoclinic | — | 4.60 g/cm³ |
| Lautite | CuAsS | Orthorhombic | — | 4.90 g/cm³ |
| Lavendulan | NaCaCu₅(AsO₄)₄Cl·5H₂O | Monoclinic | 2.8 | 3.54 g/cm³ |