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- Hexagonal
Hexagonal crystal system
403 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Achávalite | FeSe | 2.5 | 4.94 g/cm³ |
| Agakhanovite-(Y) | YCa☐₂KBe₃Si₁₂O₃₀ | 6.0 | — |
| Agardite-(Ce) | CeCu²⁺₆(AsO₄)₃(OH)₆·3H₂O | 3.0 | — |
| Agardite-(La) | LaCu²⁺₆(AsO₄)₃(OH)₆·3H₂O | — | — |
| Agardite-(Nd) | NdCu²⁺₆(AsO₄)₃(OH)₆·3H₂O | — | — |
| Agardite-(Y) | YCu²⁺₆(AsO₄)₃(OH)₆·3H₂O | — | — |
| Aiolosite | Na₂(Na₂Bi)(SO₄)₃Cl | — | — |
| Akdalaite | Al₅O₇(OH) | — | — |
| Akhtenskite | MnO₂ | 2.0 | — |
| Alexkhomyakovite | K₆(Ca₂Na)(CO₃)₅Cl·6H₂O | — | — |
| Alforsite | Ba₅(PO₄)₃Cl | 5.0 | 4.57 g/cm³ |
| Alfredopetrovite | Al₂(Se⁴⁺O₃)₃·6H₂O | 2.5 | — |
| Allargentum | Ag₁₋ₓSbₓ (x=0.09-0.16) | 3.5 | 10.00 g/cm³ |
| Almarudite | K(☐,Na)₂(Mn,Fe,Mg)₂[(Be,Al)₃Si₁₂]O₃₀ | 6.0 | 2.72 g/cm³ |
| Aluminosugilite | — | — | — |
| Arisite-(Ce) | NaCe₂(CO₃)₂[F₂ₓ(CO₃)₁₋ₓ]F | — | — |
| Arisite-(La) | NaLa₂(CO₃)₂[F₂ₓ(CO₃)₁₋ₓ]F | — | — |
| Asbolane | Mn⁴⁺(O,OH)₂·(Co,Ni,Mg,Ca)ₓ(OH)₂ₓ·nH₂O | — | — |
| Astrocyanite-(Ce) | Cu₂(Ce,Nd,La)₂(UO₂)(CO₃)₅(OH)₂ * 1.5H₂O | — | — |
| Atheneite | Pd₂As₀.₇₅Hg₀.₂₅ | 5.0 | 10.20 g/cm³ |
| Aurihydrargyrumite | Au₆Hg₅ | 2.5 | 16.09 g/cm³ |
| Avdeevite | NaAl₄(Be₅Li)(Si₆O₁₈)₂(H₂O)1-2 | — | — |
| Averievite | Cu₆(VO₄)₂O₂Cl₂ | — | — |
| Badengzhuite | — | — | — |
| Balliranoite | (Na,K)₆Ca₂(Si₆Al₆O₂₄)Cl₂(CO₃) | — | — |
| Barioferrite | BaFe³⁺₁₂O₁₉ | — | — |
| Barkovite | Ni₁,₅Sn | — | — |
| Barlowite | Cu₄BrF(OH)₆ | — | — |
| Barringerite | (Fe,Ni)₂P | — | — |
| Bastnäsite-(Ce) | Ce(CO₃)F | — | 4.99 g/cm³ |
| Bastnäsite-(La) | LaCO₃F | — | 4.74 g/cm³ |
| Bastnäsite-(Nd) | Nd(CO₃)F | — | — |
| Bastnäsite-(Y) | Y(CO₃)F | — | — |
| Batiferrite | BaTi₂Fe³⁺₈Fe²⁺₂O₁₉ | — | — |
| Bazirite | BaZr(Si₃O₉) | — | — |
| Bazzite | Be₃Sc₂(Si₆O₁₈) | — | — |
| Belkovite | Ba₃(Nb,Ti)₆(Si₂O₇)₂O₁₂ | — | — |
| Bellbergite | (K,Ba,Sr)₂Sr₂Ca₂(Ca,Na)₄(Si,Al)₃₆O₇₂·30H₂O | — | — |
| Benitoite | — | 6.0 | 3.65 g/cm³ |
| Bentorite | Ca₆Cr₂(SO₄)₃(OH)₁₂·26H₂O | 2.0 | — |
| Beryl | Be₃Al₂Si₆O₁₈ | — | — |
| Betzite | Na₆Ca₂(Al₆Si₆O₂₄)Cl₄ | — | — |
| Blatonite | (UO₂)CO₃·H₂O | — | — |
| Bonaccorsiite | KK₂Na₃(Al₆Si₃₆)O₈₄ | — | — |
| Bosoite | SiO₂·nCₓH₂ₓ₊₂ | — | — |
| Braitschite-(Ce) | (Ca,Na₂)₇(Ce,La)₂B₂₂O₄₃·7H₂O | — | — |
| Breithauptite | NiSb | 5.5 | 8.76 g/cm³ |
| Brockite | (Ca,Th,Ce)PO₄·H₂O | — | — |
| Bromellite | BeO | 9.0 | 3.02 g/cm³ |
| Brugnatellite | Mg₆Fe³⁺(CO₃)(OH)₁₃·4H₂O | — | — |
| Burbankite | (Na,Ca)₃(Sr,Ba,Ce)₃(CO₃)₅ | — | — |
| Buseckite | (Fe,Zn,Mn)S | — | — |
| Buttgenbachite | Cu₁₉(NO₃)₂(OH)₃₂Cl₄·nH₂O | — | — |
| Cacoxenite | Fe³⁺₂₄AlO₆(PO₄)₁₇(OH)₁₂·75H₂O | — | — |
| Cadmium (native) | — | — | — |
| Cadmoselite | CdSe | 4.0 | 5.48 g/cm³ |
| Calcioburbankite | Na₃(Ca,Ce,Sr,La)₃(CO₃)₅ | — | — |
| Calciopetersite | CaCu₆(PO₄)₂(PO₃OH)(OH)₆·3H₂O | — | — |
| Calciotantite | CaTa₄O₁₁ | — | 7.55 g/cm³ |
| Cancrinite | (Na,Ca,☐)₈(Al₆Si₆)O₂₄(CO₃,SO₄)₂·2H₂O | — | — |
| Cancrisilite | Na₇(Si₇Al₅)O₂₄(CO₃)·3H₂O | 5.0 | — |
| Carraraite | Ca₃(SO₄)[Ge(OH)₆](CO₃) * 12H₂O | — | — |
| Carrboydite | (Ni₁-xAlx)(SO₄)x/₂(OH)₂ * nH₂O | — | — |
| Catamarcaite | Cu₆GeWS₈ | — | 4.81 g/cm³ |
| Cesanite | Na₃Ca₂(SO₄)₃(OH) | — | — |
| Cetineite | NaK₅Sb₁₄S₆O₁₈·6H₂O | 3.5 | 4.21 g/cm³ |
| Chaoite | C | — | — |
| Chihuahuaite | FeAl₁₂O₁₉ | — | — |
| Chiluite | Bi₃Te⁶⁺Mo⁶⁺O₁₀.₅ | — | — |
| Chiyokoite | Ca3Si(CO3)[B(OH)4]O (OH)5·12H2O | — | — |
| Chlorapatite | Ca₅(PO₄)₃Cl | 5.0 | — |
| Chlorellestadite | Ca₅(SiO₄)₁.₅(SO₄)₁.₅Cl | — | — |
| Chlormagaluminite | Mg₄Al₂(OH)₁₂Cl₂(H₂O)₂ | — | — |
| Chloromagnesite | MgCl₂ | — | 2.28 g/cm³ |
| Claringbullite | Cu₄ClF(OH)₆ | — | — |
| Connellite | Cu₃₆(SO₄)(OH)₆₂Cl₈·6H₂O | 3.0 | — |
| Cordylite-(Ce) | (Na,Ca,☐)BaCe₂(CO₃)₄(F,O) | 4.5 | — |
| Cordylite-(La) | NaCaBa₂La₃Sr(CO₃)₈F₂ | — | — |
| Covellite | CuS | — | — |
| Crowningshieldite | (Ni₀.₉Fe₀.₁₀)S | — | — |