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- Orthorhombic
Orthorhombic crystal system
1,001 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Edwindavisite | Cu(C₂O₄)(NH₃) | — | — |
| Elaliite | (Fe²⁺₈Fe³⁺)(PO₄)O₈ | — | — |
| Eldragónite | Cu₆BiSe₄(Se₂) | — | — |
| Ellinaite | — | — | — |
| Elpidite | Na₂ZrSi₆O₁₅·3H₂O | 5.0 | — |
| Emeleusite | Li₂Na₄Fe₂Si₁₂O₃₀ | — | — |
| Emplectite | CuBiS₂ | 2.0 | 6.37 g/cm³ |
| Empressite | AgTe | — | — |
| Enargite | Cu₃AsS₄ | 3.0 | — |
| Enstatite | Mg₂Si₂O₆ | 5.5 | 3.20 g/cm³ |
| Epsomite | MgSO₄·7H₂O | 2.0 | 1.67 g/cm³ |
| Ericaite | Fe²⁺₃B₇O₁₃Cl | — | — |
| Eriochalcite | CuCl₂·2H₂O | — | — |
| Erlianite | Fe²⁺₄Fe³⁺₂Si₆O₁₅(OH)₈ | — | — |
| Erzwiesite | Ag₈Pb₁₂Bi₁₆S₄₀ | — | — |
| Escheite | Ca₂NaMnTi₅[Si₁₂O₃₄]O₂(OH)₃·12H₂O | — | — |
| Esdanaite-(Ce) | — | — | — |
| Espadaite | Na₄Ca₃Mg₂[AsO₃(OH)]₂[AsO₂(OH)₂]₁₀·7H₂O | — | — |
| Eucairite | AgCuSe | 2.5 | — |
| Euchroite | Cu₂AsO₄(OH)·3H₂O | — | — |
| Euxenite-(Y) | (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆ | — | — |
| Evenkite | C₂₃H₄₈ | 1.0 | — |
| Evseevite | — | — | — |
| Fabrièsite | Na₃Al₃Si₃O₁₂·2H₂O | — | — |
| Falcondoite | Ni₄Si₆O₁₅(OH)₂·6H₂O | — | — |
| Falottaite | MnC₂O₄·3H₂O | — | — |
| Fangite | Tl₃AsS₄ | — | 5.92 g/cm³ |
| Fassinaite | Pb₂(CO₃)(S₂O₃) | — | — |
| Fayalite | Fe²⁺₂SiO₄ | — | — |
| Fedorovskite | Ca₂Mg₂B₄O₇(OH)₆ | — | — |
| Feiite | Fe²⁺₂(Fe²⁺Ti⁴⁺)O₅ | — | — |
| Fermiite | Na₄(UO₂)(SO₄)₃·3H₂O | — | — |
| Ferrierite-K | (K,Na)₅(Si₃₁Al₅)O₇₂·18H₂O | — | — |
| Ferrierite-Mg | [Mg₂(K,Na)₂Ca₀.₅](Si₂₉Al₇)O₇₂·18H₂O | — | — |
| Ferrierite-NH4 | (NH₄,Mg₀.₅)₅(Al₅Si₃₁O₇₂)·22H₂O | — | — |
| Ferrimolybdite | Fe³⁺₂(Mo⁶⁺O₄)₃·7H₂O | — | — |
| Ferriprehnite | — | — | — |
| Ferrirockbridgeite | (Fe³⁺₀.₆₇☐₀.₃₃)₂(Fe³⁺)₃(PO₄)₃(OH)₄(H₂O) | — | — |
| Ferrisepiolite | (Fe³⁺,Fe²⁺,Mg)₄[(Si,Fe³⁺)₆O₁₅](O,OH)₂·6H₂O | 2.5 | — |
| Ferrisicklerite | Li₁-x(Fe³⁺xFe²⁺₁-x)PO₄ | — | — |
| Ferro-anthophyllite | ☐Fe²⁺₂Fe²⁺₅Si₈O₂₂(OH)₂ | — | — |
| Ferro-ferri-holmquistite | ☐Li₂(Fe²⁺₃Fe³⁺₂)Si₈O₂₂(OH)₂ | — | — |
| Ferro-gedrite | ☐{Fe²⁺₂}{Fe²⁺₃Al₂}(Al₂Si₆O₂₂)(OH)₂ | — | — |
| Ferro-holmquistite | ☐Li₂(Fe²⁺₃Al₂)Si₈O₂₂(OH)₂ | 5.5 | — |
| Ferro-papikeite | — | — | — |
| Ferropseudobrookite | Fe²⁺Ti⁴⁺₂O₅ | — | — |
| Ferrorockbridgeite | (Fe²⁺,Mn²⁺)₂(Fe³⁺)₃(PO₄)₃(OH)₄(H₂O) | — | — |
| Ferroselite | FeSe₂ | — | 7.21 g/cm³ |
| Ferrosilite | — | — | — |
| Ferruccite | NaBF₄ | 3.0 | 2.66 g/cm³ |
| Finchite | Sr(UO₂)₂(V₂O₈)*₅H₂O | — | — |
| Fivegite | K₄Ca₂[AlSi₇O₁₇(O₂-xOHx)][(H₂O)₂-xOHx]Cl | — | — |
| Flagstaffite | C₁₀H₂₂O₃ | — | — |
| Fleisstalite | FeSO₃·3H₂O | — | — |
| Flinteite | K₂ZnCl₄ | — | 2.23 g/cm³ |
| Florenskyite | FeTiP | — | 6.10 g/cm³ |
| Fluellite | Al₂(PO₄)F₂(OH)(H₂O)₃·4H₂O | 3.0 | — |
| Fluorchegemite | Ca₇(SiO₄)₃F₂ | — | — |
| Fluorwavellite | Al₃(PO₄)₂(OH)₂F*₅H₂O | — | — |
| Foggite | — | — | — |
| Fontanite | — | — | — |
| Forsterite | Mg₂SiO₄ | 7.0 | 3.24 g/cm³ |
| Fourmarierite | Pb(UO₂)₄O₃(OH)₄·4H₂O | — | — |
| Francevillite | Ba(UO₂)₂(VO₄)₂·5H₂O | 3.0 | — |
| Fredrikssonite | Mg₂Mn³⁺O₂(BO₃) | 6.0 | — |
| Frohbergite | FeTe₂ | — | 8.14 g/cm³ |
| Frondelite | — | 4.5 | — |
| Gaildunningite | Hg²⁺₃[NHg²⁺₂]₁₈(Cl,I,OH,Br,S)₂₄ | — | — |
| Galeaclolusite | Al₆(AsO₄)₃(OH)₉(H₂O)₄·8H₂O | — | 2.27 g/cm³ |
| Galenobismutite | PbBi₂S₄ | — | 7.04 g/cm³ |
| Garavellite | FeSbBiS₄ | — | — |
| Garyansellite | (Mg,Fe)₃(PO₄)₂(OH,O) * 1.₅H₂O | — | — |
| Gaultite | Na₄Zn₂Si₇O₁₈·5H₂O | — | — |
| Gedrite | ☐Mg₂Mg₃Al₂(Si₆Al₂)O₂₂(OH)₂ | — | — |
| Georgerobinsonite | Pb₄(CrO₄)₂(OH)₂FCl | — | — |
| Gerhardtite | Cu₂NO₃(OH)₃ | — | — |
| Gerstmannite | MnMgZn(SiO₄)(OH)₂ | — | — |
| Geschieberite | K₂(UO₂)(SO₄)₂·2H₂O | — | — |
| Gismondine-Sr | Sr₄(Si₈Al₈O₃₂)·9H₂O | — | — |
| Gladite | CuPbBi₅S₉ | — | — |