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Trigonal crystal system
584 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Dutrowite | — | — | — |
| Dzierżanowskite | CaCu₂S₂ | — | — |
| Ecandrewsite | (Zn,Fe²⁺,Mn²⁺)TiO₃ | — | — |
| Ehrigite | Bi₈Te₃ | — | — |
| Eirikite | KNa₆Be₂(Si₁₅Al₃)O₃₉F₂ | — | — |
| Eitelite | Na₂Mg(CO₃)₂ | 3.5 | 2.80 g/cm³ |
| Ekplexite | (Nb,Mo)S₂·(Mg₁₋ₓAlₓ)(OH)₂₊ₓ | — | — |
| Elbaite | Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH) | 7.0 | — |
| Eliopoulosite | — | — | — |
| Ellisite | Tl₃AsS₃ | — | 6.61 g/cm³ |
| Erazoite | Cu₄SnS₆ | — | — |
| Ernienickelite | NiMn⁴⁺₃O₇(H₂O)₃ | — | — |
| Erniggliite | Tl₂SnAs₂S₆ | — | 4.86 g/cm³ |
| Ernstburkeite | Mg(CH₃SO₃)₂·12H₂O | — | — |
| Erssonite | — | — | — |
| Ertlite | NaAl₃Al₆(Si₄B₂O₁₈)(BO₃)₃(OH)₃O | — | — |
| Eskolaite | Cr₂O₃ | — | — |
| Ettringite | Ca₆Al₂(SO₄)₃(OH)₁₂·26H₂O | — | — |
| Eucryptite | LiAlSiO₄ | 6.5 | 2.69 g/cm³ |
| Eudialyte | Na₁₅Ca₆(Fe²⁺,Mn²⁺)₃Zr₃[Si₂₅O₇₃](O,OH,H₂O)₃(OH,Cl)₂ | — | — |
| Fantappièite | [Na₈₂.₅Ca₃₃K₁₆.₅]Σ=₁₃₂(Si₉₉Al₉₉O₃₉₆)(SO₄)₃₃·6H₂O | — | — |
| Feklichevite | Na₁₁Ca₉(Fe³⁺,Fe²⁺)₂Zr₃Nb[Si₂₅O₇₃](OH,H₂O,Cl,O)₅ | — | — |
| Fencooperite | Ba₆Fe³⁺₃Si₈O₂₃(CO₃)₂Cl₃·H₂O | — | — |
| Fengchengite | Na₁₂☐₃(Ca,Sr)₆Fe³⁺₃Zr₃Si(Si₂₅O₇₃)(H₂O,OH)₃(OH,Cl)₂ | — | — |
| Fengruiite | [Ag₆Sb₂S₇][Ag₉CuS₂Te₂] | — | — |
| Ferrihydrite | Fe³⁺₁₀O₁₄(OH)₂ | — | — |
| Ferrinatrite | Na₃Fe(SO₄)₃·3H₂O | — | — |
| Ferrokentbrooksite | Na₁₅Ca₆(Fe,Mn)₃Zr₃NbSi₂₅O₇₃(O,OH,H₂O)₃Cl₂ | — | — |
| Ferromerrillite | Ca₉NaFe(PO₄)₇ | — | — |
| Ferronigerite-2N1S | (Al,Fe,Zn)₂(Al,Sn)₆O₁₁(OH) | — | — |
| Ferrotorryweiserite | Rh₅Fe₁₀S₁₆ | — | — |
| Ferrovalleriite | 2[(Fe,Cu)S]·1.53[(Fe,Al,Mg)(OH)₂] | — | — |
| Feruvite | Ca(Fe²⁺)₃MgAl₅(Si₆O₁₈)(BO₃)₃(OH)₃(OH) | 7.0 | — |
| Fillowite | Na₃CaMn²⁺₁₁(PO₄)₉ | — | — |
| Florencite-(Sm) | (Sm,Nd)Al₃(PO₄)₂(OH)₆ | — | — |
| Fluocerite-(La) | LaF₃ | — | 5.98 g/cm³ |
| Fluor-buergerite | Na(Fe³⁺₃)Al₆(Si₆O₁₈)(BO₃)₃O₃F | 7.0 | — |
| Fluor-dravite | NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃F | 7.0 | — |
| Fluor-elbaite | Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃F | 7.5 | — |
| Fluor-liddicoatite | Ca(Li₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃F | 7.5 | — |
| Fluor-rossmanite | ◻(Al₂Li)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃F | — | — |
| Fluor-schorl | NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃F | 7.0 | — |
| Fluor-tsilaisite | NaMn²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃F | 7.0 | — |
| Fluor-uvite | CaMg₃(Al₅Mg)(Si₆O₁₈)(BO₃)₃(OH)₃F | 7.5 | — |
| Fluornatrocoulsellite | (Na₁.₅Ca₀.₅)(Mg₁.₅Al₀.₅)F₆F | 4.5 | — |
| Foitite | (☐,Na)(Fe²⁺₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃OH | 7.0 | — |
| Fougèrite | — | — | — |
| Franzinite | (Na,K)₆Ca₂(Al₆Si₆O₂₄)(SO₄)₂·2H₂O | — | — |
| Fuenzalidaite | — | — | — |
| Fuettererite | Pb₃Cu²⁺₆Te⁶⁺O₆(OH)₇Cl₅ | — | — |
| Fuyuanite | Mg₇Nb₆O₁₈(OH)₈ | — | — |
| Gagarinite-(Ce) | NaCaCeF₆ | — | — |
| Galeite | Na₁₅(SO₄)₅F₄Cl | — | — |
| Galileiite | NaFe²⁺₄(PO₄)₃ | — | — |
| Gallobeudantite | PbGa₃(AsO₄)(SO₄)(OH)₆ | 4.0 | 4.61 g/cm³ |
| Galloplumbogummite | Pb(Ga,Al,Ge)₃(PO₄)₂(OH)₆ | — | 4.62 g/cm³ |
| Gaspéite | NiCO₃ | — | 4.43 g/cm³ |
| Gazeevite | BaCa₆(SiO₄)₂(SO₄)₂O | — | — |
| Geerite | Cu₈S₅ | — | — |
| Geikielite | MgTiO₃ | — | 3.89 g/cm³ |
| Georgbarsanovite | Na₁₂(Mn,Sr,REE)₃Ca₆Fe²⁺₃Zr₃NbSi₂₅O₇₆Cl₂·H₂O | — | — |
| Gillardite | Cu₃Ni(OH)₆Cl₂ | — | — |
| Giuseppettite | (Na,K,Ca)₇-₈(Al₆Si₆O₂₄)(SO₄,Cl)₁-₂ | — | — |
| Gladkovskyite | MnTlAs₃S₆ | — | — |
| Godovikovite | (NH₄)Al(SO₄)₂ | — | — |
| Golyshevite | Na₁₀Ca₉Zr₃Fe₂SiNb(Si₃O₉)₂(Si₉O₂₇)₂(OH)₃(CO₃)·H₂O | — | — |
| Gordaite | NaZn₄(SO₄)(OH)₆Cl·6H₂O | — | — |
| Goyazite | SrAl₃(PO₄)(PO₃OH)(OH)₆ | — | — |
| Gratonite | Pb₉As₄S₁₅ | 2.5 | — |
| Grattarolaite | — | — | — |
| Graulichite-(La) | LaFe³⁺₃(AsO₄)₂(OH)₆ | — | — |
| Greenwoodite | Ba₂₋ₓ(V³⁺OH)ₓV³⁺₉(Fe³⁺,Fe²⁺)₂Si₂O₂₂ | — | — |
| Grokhovskyite | — | — | — |
| Gruzdevite | Cu₆Hg₃Sb₄S₁₂ | — | 5.53 g/cm³ |
| Gurimite | Ba₃(VO₄)₂ | — | 5.09 g/cm³ |
| Haitaite-(La) | — | — | — |
| Harkerite | Ca₄₈Mg₁₆[AlSi₄O₁₅(OH)]₄(BO₃)₁₆(CO₃)₁₆·2(H₂O,HCl) | — | — |
| Haydeeite | Cu₃Mg(OH)₆Cl₂ | — | — |
| Heazlewoodite | — | 4.0 | — |
| Hedegaardite | (Ca,Na)₉(Ca,Na)Mg(PO₄)₆(PO₃OH) | — | — |