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Orthorhombic crystal system
1,001 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Becquerelite | Ca(UO₂)₆O₄(OH)₆·8(H₂O) | 2.5 | — |
| Behoite | Be(OH)₂ | 4.0 | — |
| Belmonteite | CaMn₂(AsO₄)₂·7H₂O | — | — |
| Bergbauerite | (H₂O)₂Mn₂(Fe₂Ti)(PO₄)₄(OH)₂(H₂O)₁₀·4H₂O | — | — |
| Bernalite | — | 4.0 | — |
| Berthierite | FeSb₂S₄ | — | — |
| Bertrandite | Be₄Si₂O₇(OH)₂ | — | 2.54 g/cm³ |
| Beryllite | Be₃(SiO₄)(OH)₂ * H₂O | — | — |
| Beryllocordierite-Na | NaMg₄(Al₅Be)(AlSi₅O₁₈)₂·2H₂O | — | — |
| Betekhtinite | (Cu,Fe)₂₁Pb₂S₁₅ | — | — |
| Beyerite | CaBi₂O₂(CO₃)₂ | — | — |
| Bezsmertnovite | — | — | — |
| Bigcreekite | BaSi₂O₅·4H₂O | — | — |
| Billietite | — | — | — |
| Birchite | Cd₂Cu₂(PO₄)₂(SO₄)·5H₂O | — | — |
| Bismuthinite | Bi₂S₃ | 2.0 | 6.60 g/cm³ |
| Bismutite | Bi₂O₂(CO₃) | — | 7.86 g/cm³ |
| Blatterite | Sb⁵⁺₃Mn³⁺₉Mn²⁺₃₅O₃₂(BO₃)₁₆ | — | — |
| Blossite | — | — | — |
| Bobfinchite | — | — | — |
| Bobmeyerite | Pb₄(Al₃Cu)(Si₄O₁₂)(S₀.₅Si₀.₅O₄)(OH)₇Cl(H₂O)₃ | — | — |
| Boevskite | Pb₄(TeO₃)₂(SO₄)(S₂O₃) | — | — |
| Boggsite | Na₃Ca₈(Si₇₇Al₁₉)O₁₉₂·70H₂O | — | — |
| Bohseite | Ca₄Be₃₊ₓAl₁₋ₓSi₉O₂₅₋ₓ(OH)₃₊ₓ (x=0 to 1) | — | — |
| Bonaccordite | Ni₂Fe³⁺O₂(BO₃) | 7.0 | — |
| Boracite | Mg₃B₇O₁₃Cl | — | — |
| Borishanskiite | Pd₁+x(As,Pb)₂ , x = ₀-₀.₂ | — | — |
| Bornite | Cu₅FeS₄ | 3.0 | 5.10 g/cm³ |
| Boromullite | Al₉BSi₂O₁₉ | — | — |
| Bostwickite | CaMn₆Si₃O₁₆·7H₂O | — | — |
| Bournonite | CuPbSbS₃ | 3.0 | — |
| Bowieite | — | — | — |
| Bowlesite | — | — | — |
| Brassite | Mg(AsO₃OH)·4H₂O | — | — |
| Bredigite | Ca₇Mg(SiO₄)₄ | — | — |
| Brenkite | Ca₂(CO₃)F₂ | — | — |
| Bridgmanite | MgSiO₃ | — | — |
| Brontesite | (NH₄)₃PbCl₅ | — | — |
| Brookite | TiO₂ | — | 3.86 g/cm³ |
| Brownmillerite | Ca₂(Al,Fe³⁺)₂O₅ | — | — |
| Buchwaldite | NaCa(PO₄) | — | 3.02 g/cm³ |
| Buckhornite | (Pb₂BiS₃)(AuTe₂) | — | — |
| Burkeite | Na₄(SO₄)(CO₃) | — | — |
| Byelorussite-(Ce) | NaBa₂Ce₂MnTi₂[Si₄O₁₂]₂O₂(F,OH)·H₂O | — | — |
| Byrudite | (Be,□)(V³⁺,Ti)₃O₆ | — | — |
| Bytízite | — | — | — |
| Böhmite | AlO(OH) | 3.5 | 3.41 g/cm³ |
| Běhounekite | U(SO₄)₂(H₂O)₄ | — | — |
| Cabriite | Pd₂CuSn | — | — |
| Cafeosite | Ca₄Fe²⁺₃Fe³⁺₂◻O₆S₄ | — | — |
| Calamaite | Na₂TiO(SO₄)₂*₂H₂O | — | — |
| Calciborite | CaB₂O₄ | — | 2.87 g/cm³ |
| Calcio-olivine | Ca₂(SiO₄) | — | 2.96 g/cm³ |
| Calcioancylite-(Ce) | (Ce,Ca,Sr)CO₃(OH,H₂O) | — | — |
| Caledonite | Cu₂Pb₅(SO₄)₃(CO₃)(OH)₆ | — | — |
| Calkinsite-(Ce) | (Ce,La)₂(CO₃)₃ * 4H₂O | — | — |
| Calzirtite | Ca₂Zr₅Ti₂O₁₆ | — | 4.84 g/cm³ |
| Canfieldite | Ag₈SnS₆ | — | 6.23 g/cm³ |
| Capgaronnite | AgHgClS | — | — |
| Carbocernaite | (Ca,Na)(Sr,Ce,Ba)(CO₃)₂ | 3.0 | — |
| Carbonatecyanotrichite | Cu₄Al₂CO₃(OH)₁₂·2H₂O | — | — |
| Cardite | Zn₅.₅(AsO₄)₂(AsO₃OH)(OH)₃*₃H₂O | — | — |
| Carlosbarbosaite | (UO₂)₂Nb₂O₆(OH)₂·2H₂O | — | — |
| Carmeltazite | ZrAl₂Ti₄O₁₁ | — | — |
| Carnallite | KMgCl₃·6H₂O | 2.5 | — |
| Carpholite | Mn²⁺Al₂(Si₂O₆)(OH)₄ | — | — |
| Cassagnaite | Ca₄Fe³⁺₄V³⁺₂(OH)₆O₂(Si₃O₁₀)(SiO₄)₂ | — | — |
| Catalanoite | Na₂HPO₄·8H₂O | — | — |
| Cavansite | — | — | — |
| Cavoite | CaV₄+₃O₇ | — | — |
| Cayalsite-(Y) | CaY₆Al₂Si₄O₁₈F₆ | — | — |
| Celestine | SrSO₄ | 3.2 | 3.98 g/cm³ |
| Cerussite | PbCO₃ | — | 6.60 g/cm³ |
| Cervantite | Sb³⁺Sb⁵⁺O₄ | 4.5 | — |
| Cesbronite | Cu₃Te⁶⁺O₄(OH)₄ | 3.0 | — |
| Chalcocyanite | CuSO₄ | 3.5 | 3.94 g/cm³ |
| Chalcostibite | CuSbS₂ | — | 4.95 g/cm³ |
| Chambersite | Mn₃B₇O₁₃Cl | — | 3.36 g/cm³ |
| Chanabayaite | Cu₂Cl(N₃C₂H₂)₂(NH₃,Cl,H₂O,☐)₄ | — | — |
| Chegemite | Ca₇(SiO₄)₃(OH)₂ | — | — |