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Trigonal crystal system
584 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Hedleyite | Bi₇Te₃ | — | — |
| Heimaeyite | Na₃Al(SO₄)₃ | — | — |
| Hematite | Fe₂O₃ | 6.0 | 5.10 g/cm³ |
| Hematolite | (Mn,Mg,Al)₁₅(AsO₄)₂(AsO₃)(OH)₂₃ | — | — |
| Hemleyite | (Fe²⁺₀.₄₈Mg₀.₃₇Ca₀.₀₄Na₀.₀₄Mn²⁺₀.₀₃Al₀.₀₃Cr³⁺₀.₀₁)sum=₁.₀₀Si₁.₀₀O₃ | — | — |
| Herbertsmithite | Cu₃Zn(OH)₆Cl₂ | — | — |
| Hidalgoite | PbAl₃(SO₄)(AsO₄)(OH)₆ | 4.5 | — |
| Hinsdalite | PbAl₃(SO₄)(PO₄)(OH)₆ | — | — |
| Hitachiite | Pb₅Bi₂Te₂S₆ | — | — |
| Hodgesmithite | (Cu,Zn)₆Zn(SO₄)₂(OH)₁₀*₃H₂O | — | — |
| Honessite | (Ni₁-xFe³⁺x)(OH)₂[SO₄]x/₂ * nH₂O | — | — |
| Hongshiite | PtCu | 4.0 | 15.74 g/cm³ |
| Huanghoite-(Ce) | BaCe(CO₃)₂F | — | — |
| Huanghoite-(Nd) | BaNd(CO₃)₂F | — | — |
| Huangite | Ca₀.₅Al₃(SO₄)₂(OH)₆ | — | — |
| Huenite | Cu₄(MoO₄)₃(OH)₂ | — | — |
| Humberstonite | K₃Na₇Mg₂(SO₄)₆(NO₃)₂·6H₂O | 2.5 | — |
| Hundholmenite-(Y) | (Y,REE,Ca,Na)₁₅(Al,Fe³⁺)(CaxAs³⁺₁-x)(Si,As₅+)Si₆B₃(O,F)₄₈ | — | — |
| Huntite | CaMg₃(CO₃)₄ | — | — |
| Hydrocerussite | Pb₃(CO₃)₂(OH)₂ | — | — |
| Hydroniumjarosite | (H₃O)Fe₃(SO₄)₂(OH)₆ | — | — |
| Hydrotalcite | Mg₆Al₂(CO₃)(OH)₁₆ * 4H₂O | 2.0 | — |
| Hydroxykenoelsmoreite | (☐,Pb)₂(W,Fe³⁺,Al)₂(O,OH)₆(OH) | 3.0 | 5.81 g/cm³ |
| Iangreyite | Ca₂Al₇(PO₄)₂(PO₃OH)₂(OH,F)₁₅·8H₂O | — | — |
| Ikranite | (Na,H₃O)₁₅(Ca,Mn²⁺)₆Fe³⁺₂Zr₃[(H₀-₃Si₃O₉)₂(Si₉O₂₇)₂SiO]Cl·nH₂O | 5.0 | — |
| Ikunolite | Bi₄S₃ | — | — |
| Ilmenite | Fe²⁺Ti⁴⁺O₃ | 5.5 | 4.72 g/cm³ |
| Ilyukhinite | (H₃O,Na)₁₄Ca₆Mn₂Zr₃Si₂₆O₇₂(OH)₂·3H₂O | — | — |
| Ingersonite | Ca₃Mn²⁺Sb₅+₄O₁₄ | — | — |
| Iwateite | Na₂BaMn(PO₄)₂ | — | — |
| Jacutingaite | Pt₂HgSe₃ | — | 10.58 g/cm³ |
| Jaffeite | Ca₆Si₂O₇(OH)₆ | — | — |
| Johnsenite-(Ce) | Na₁₂Ce₃Ca₆Mn₃Zr₃WSi₂₅O₇₃(CO₃)(OH)₂ | — | — |
| Johnsomervilleite | Na₁₀Ca₆Mg₁₈Fe²⁺₂₅(PO₄)₃₆ | — | — |
| Joséite-B | Bi₄Te₂S | — | — |
| Joëlbruggerite | Pb₃Zn₃(Sb⁵⁺,Te⁶⁺)As₂O₁₃(OH,O) | — | — |
| Jörgkellerite | — | — | — |
| Kalistrontite | K₂Sr(SO₄)₂ | — | — |
| Kapellasite | Cu₃Zn(OH)₆Cl₂ | — | — |
| Karchevskyite | Mg₁₈Al₉(OH)₅₄Sr₂(CO₃)₉(H₂O)₆(H₃O)₅ | — | — |
| Karelianite | V³⁺₂O₃ | — | — |
| Karlseifertite | Pb(Ga₂Ge)(AsO₄)₂(OH)₆ | — | — |
| Karpenkoite | Co₃(V₂O₇)(OH)₂·2H₂O | — | — |
| Karwowskiite | Ca₉Mg(Fe²⁺₀,₅◻₀,₅)(PO₄)₇ | — | 3.08 g/cm³ |
| Kaskasite | (Mo,Nb)S₂·(Mg₁₋ₓAlₓ)(OH)₂₊ₓ | — | — |
| Katanite | Ba₃NbFe₃Si₂O₁₄ | — | — |
| Kawazulite | Bi₂Te₂Se | 1.5 | 7.79 g/cm³ |
| Kazakovite | Na₆Mn²⁺Ti(Si₆O₁₈) | — | — |
| Kaznakhtite | — | — | — |
| Kegginite | Pb₃Ca₃[AsV₁₂O₄₀(VO)]*₂₀H₂O | — | — |
| Keithconnite | Pd₂₀Te₇ | — | 10.79 g/cm³ |
| Kentbrooksite | (Na,REE)₁₅(Ca,REE)₆(Mn²⁺,Fe²⁺)₃Zr₃Nb[Si₂₅O₇₄]F₂ * 2H₂O | — | — |
| Keplerite | — | — | — |
| Khomyakovite | Na₁₂Sr₃Ca₆Fe₃Zr₃W[Si₂₅O₇₃](O,OH,H₂O)₃(OH,Cl)₂ | — | — |
| Kintoreite | PbFe₃(PO₄)(PO₃OH)(OH)₆ | — | — |
| Kircherite | [Na₅Ca₂K](Si₆Al₆O₂₄)(SO₄)₂·0.33H₂O | — | — |
| Koenenite | Na₄Mg₉Al₄Cl₁₂(OH)₂₂ | — | — |
| Konzettite | CaMn⁴⁺Te₆⁺O₆ | — | — |
| Koryakite | NaKMg₂Al₂(SO₄)₆ | — | — |
| Kosnarite | KZr₂(PO₄)₃ | 4.5 | 3.06 g/cm³ |
| Krivovichevite | Pb₃Al(OH)₆SO₄(OH) | 3.0 | — |
| Kryzaite | Na₄(MgCr)(PO₄)₃ | — | — |
| Krásnoite | Ca₃Al₇.₇Si₃P₄O₂₂.₉(OH)₁₃.₃F₂·8H₂O | — | — |
| Kuksite | Pb₃Zn₃(PO₄)₂(TeO₆) | — | 6.16 g/cm³ |
| Kuliginite | Fe₃Mg(OH)₆Cl₂ | — | — |
| Kurilite | Ag₈Te₃Se | — | — |
| Kutnohorite | CaMn²⁺(CO₃)₂ | — | — |
| Kuvaevite | Ir₅Ni10S16 | — | — |
| Labyrinthite | (Na,K,Sr)₃₅Ca₁₂Fe₃Zr₆TiSi₅₁O₁₄₄(O,OH,H₂O)₉Cl₃ | — | — |
| Laitakarite | Bi₄Se₃ | — | — |
| Laptevite-(Ce) | NaFe²⁺(REE₇Ca₅Y₃)(SiO₄)₄(Si₃B₂PO₁₈)(BO₃)F₁₁ | — | — |
| Laurentianite | [NbO(H₂O)]₃(Si₂O₇)₂[Na(H₂O)₂]₃ | — | — |
| Lawrencite | FeCl₂ | — | 3.17 g/cm³ |
| Leifite | Na₇Be₂(Si₁₅Al₃)O₃₉(F,OH)₂ | — | — |
| Leisingite | [Mg(H₂O)₆]Cu₂MgTe⁶⁺O₆ | — | — |
| Leverettite | Cu₃CoCl₂(OH)₆ | — | — |
| Liandratite | U(Nb,Ta)₂O₈ | 3.5 | — |
| Lingbaoite | AgTe₃ | — | — |
| Liudongshengite | — | — | — |
| Llantenesite | Cu₆Al[SeO₄](OH)₁₂Cl*₃H₂O | — | — |