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Orthorhombic crystal system
1,001 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Abelloemringerite | Cu₂Pb₂Mn³⁺Mn⁴⁺₃O₁₁(OH)(H₂O)₂·H₂O | — | — |
| Abuite | CaAl₂(PO₄)₂F₂ | — | — |
| Achyrophanite | (K,Na)₃(Fe³⁺,Ti,Al,Mg)₅O₂(AsO₄)₅ | — | — |
| Acmonidesite | (NH₄,K,Pb)₈NaFe²⁺₄(SO₄)₅Cl₈ | — | — |
| Adamite | Zn₂AsO₄(OH) | 3.5 | 4.23 g/cm³ |
| Adelite | CaMgAsO₄(OH) | 5.0 | — |
| Aeschynite-(Ce) | Ce(TiNb)O₆ | — | — |
| Aeschynite-(Y) | Y(TiNb)O₆ | — | — |
| Agaite | Pb₃Cu²⁺Te⁶⁺O₅(OH)₂(CO₃) | — | — |
| Agmantinite | Ag₂MnSnS₄ | — | — |
| Agrinierite | K₂Ca[(UO₂)₃O₃(OH)₂]₂·5H₂O | — | — |
| Aguilarite | Ag₄SeS | 2.5 | — |
| Aikinite | CuPbBiS₃ | — | — |
| Aksaite | MgB₆O₇(OH)₆·2H₂O | — | — |
| Alcantarillaite | — | — | — |
| Aldermanite | Mg₅Al₁₂(PO₄)₈(OH)₂₂·32H₂O | 2.0 | — |
| Alexearlite | Hg₃(MoO₄)S₂ | — | — |
| Alfredstelznerite | Ca₄(H₂O)₄[B₄O₄(OH)₆]₄(H₂O)₁₅ | — | — |
| Allabogdanite | (Fe,Ni)₂P | — | — |
| Almagreraite | CuZnMn⁴⁺₃O₈ | — | — |
| Alpeite | Ca₄Mn³⁺₂Al₂(Mn³⁺Mg)(SiO₄)₂(Si₃O₁₀)(V₅+O₄)(OH)₆ | — | — |
| Althausite | Mg₄(PO₄)₂(OH,O)(F,☐) | — | — |
| Alumotantite | AlTaO₄ | — | 7.51 g/cm³ |
| Alvesite | NaKZrSi₆O₁₅·2H₂O | — | — |
| Alwilkinsite-(Y) | Y(UO₂)₃(SO₄)₂O(OH)₃(H₂O)₇·7H₂O | — | — |
| Amaterasuite | Sr₄Ti₆Si₄O₂₃(OH)Cl | — | — |
| Ammineite | CuCl₂·2NH₃ | — | — |
| Ammoniozippeite | (NH₄)₂[(UO₂)₂(SO₄)O₂]*H₂O | — | — |
| Analcime | Na(AlSi₂O₆)·H₂O | — | — |
| Ancylite-(Ce) | CeSr(CO₃)₂(OH)·H₂O | — | — |
| Ancylite-(La) | LaSr(CO₃)₂(OH)·H₂O | — | — |
| Andalusite | Al₂SiO₅ | 7.5 | 3.15 g/cm³ |
| Andreyivanovite | FeCrP | — | 6.65 g/cm³ |
| Anduoite | RuAs₂ | — | 8.23 g/cm³ |
| Angarfite | NaFe³⁺₅(PO₄)₄(OH)₄·4H₂O | — | — |
| Anglesite | PbSO₄ | — | 6.34 g/cm³ |
| Anhydrite | CaSO₄ | 3.5 | 2.98 g/cm³ |
| Anilite | Cu₇S₄ | 3.0 | — |
| Anthophyllite | ☐Mg₂Mg₅Si₈O₂₂(OH)₂ | — | — |
| Antimonselite | Sb₂Se₃ | — | 5.51 g/cm³ |
| Aragonite | CaCO₃ | 3.8 | 2.93 g/cm³ |
| Arcanite | K₂[SO₄] | 2.0 | — |
| Arcubisite | Ag₆CuBiS₄ | — | — |
| Ardennite-(As) | Mn²⁺₄Al₄(AlMg)(VO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆ | — | — |
| Ardennite-(V) | Mn²⁺₄Al₄(AlMg)(VO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆ | — | — |
| Argyrodite | Ag₈GeS₆ | — | 6.20 g/cm³ |
| Armalcolite | (Mg,Fe²⁺)Ti₂O₅ | — | — |
| Armenite | BaCa₂(Al₆Si₉)O₃₀·2H₂O | — | 2.76 g/cm³ |
| Arsendescloizite | — | 4.0 | — |
| Arsenoclasite | — | — | — |
| Arsenohopeite | Zn₃(AsO₄)₂·4H₂O | 3.0 | 3.42 g/cm³ |
| Arsenolamprite | As | 2.0 | — |
| Arsenovanmeersscheite | U(UO₂)₃(AsO₄)₂(OH)₆·4H₂O | — | — |
| Arsenuranospathite | Al(UO₂)₂(AsO₄)₂F·20H₂O | 2.0 | 2.54 g/cm³ |
| Arsenuranylite | Ca(UO₂)₄(AsO₄)₂(OH)₄ * 6H₂O | — | — |
| Asimowite | Fe₂SiO₄ | — | 4.47 g/cm³ |
| Atacamite | Cu₂Cl(OH)₃ | — | — |
| Athabascaite | Cu₅Se₄ | 2.5 | — |
| Attikaite | Ca₃Cu₂Al₂(AsO₄)₄(OH)₄·2H₂O | — | — |
| Auerbakhite | — | — | — |
| Auriacusite | Fe³⁺Cu²⁺(AsO₄)O | — | — |
| Austinite | CaZnAsO₄(OH) | — | 4.32 g/cm³ |
| Autunite | Ca(UO₂)₂(PO₄)₂·(10-12)H₂O | — | — |
| Avogadrite | KBF₄ | — | 2.63 g/cm³ |
| Axelite | Na₁₄Cu₇(AsO₄)₈F₂Cl₂ | — | — |
| Azoproite | Mg₂(Ti₀.₅Mg₀.₅)O₂(BO₃) | 5.5 | — |
| Badakhshanite-(Y) | Y₂Mn₄Al(Si₂B₇BeO₂₄) | — | — |
| Bahariyaite | — | — | — |
| Balipholite | BaLiMg₂Al₃(Si₂O₆)₂(OH)₄ | — | — |
| Balkanite | Ag₅Cu₉HgS₈ | — | — |
| Balyakinite | Cu²⁺(Te⁴⁺O₃) | 3.0 | — |
| Banalsite | Na₂BaAl₄Si₄O₁₆ | — | 2.95 g/cm³ |
| Barberiite | NH₄BF₄ | — | 1.86 g/cm³ |
| Bario-orthojoaquinite | (Ba,Sr)₄Fe₂Ti₂[Si₄O₁₂]₂O₂ * H₂O | — | — |
| Barioperovskite | BaTiO₃ | — | 5.91 g/cm³ |
| Barrerite | Na₂(Si₇Al₂)O₁₈·6H₂O | — | — |
| Barylite | BaBe₂Si₂O₇ | — | 4.02 g/cm³ |
| Baryte | BaSO₄ | — | 4.42 g/cm³ |
| Bavenite | Ca₄Be₂₊ₓAl₂₋ₓSi₉O₂₆₋ₓ(OH)₂₊ₓ (x=0 to 1) | — | — |
| Bayanoboite-(Y) | Ba₂Y(CO₃)₂F₃ | — | 4.43 g/cm³ |