- Home
- Crystal systems
- Hexagonal
Hexagonal crystal system
403 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Hydroxycancrinite | (Na,Ca,K)₈(AlSi)₆O₂₄(OH,CO₃)₂·2H₂O | — | — |
| Hydroxylapatite | Ca₅(PO₄)₃(OH) | 5.0 | — |
| Hydroxylbastnäsite-(Ce) | Ce(CO₃)(OH) | — | — |
| Hydroxylbastnäsite-(La) | La(CO₃)(OH) | — | — |
| Hydroxylbastnäsite-(Nd) | Nd(CO₃)(OH) | — | — |
| Hydroxylborite | Mg₃(BO₃)(OH)₃ | — | — |
| Hydroxylpyromorphite | Pb₅(PO₄)₃(OH) | — | — |
| Hypercinnabar | HgS | 3.0 | 7.38 g/cm³ |
| Ice | H₂O | 1.5 | 0.92 g/cm³ |
| Ilirneyite | Mg₀.₅ZnMn³⁺(Te₄+O₃)₃·4.5H₂O | — | — |
| Iltisite | HgAgSCl | — | — |
| Ilímaussite-(Ce) | — | — | — |
| Imayoshiite | Ca₃Al(CO₃)[B(OH)₄](OH)₆·12H₂O | — | — |
| Indialite | Mg₂Al₃(AlSi₅O₁₈) | — | 2.42 g/cm³ |
| Iodargyrite | AgI | — | 5.81 g/cm³ |
| Iowaite | Mg₆Fe³⁺₂(OH)₁₆Cl₂·4H₂O | 1.5 | 2.10 g/cm³ |
| Iquiqueite | K₃Na₄Mg(CrO₄)B₂₄O₃₉(OH)·12H₂O | — | — |
| Irtyshite | Na₂(Ta,Nb)₄O₁₁ | — | — |
| Iseite | Mn₂Mo₃O₈ | — | — |
| Jagoite | Pb₁₈Fe³⁺₄[Si₄(Si,Fe³⁺)₆][Pb₄Si₁₆(Si,Fe)₄]O₈₂Cl₆ | — | — |
| Jaipurite | CoS | — | — |
| Jamborite | Ni(OH,S,O)₂·nH₂O | — | — |
| Jarosite | KFe³⁺₃(SO₄)₂(OH)₆ | — | — |
| Jedwabite | Fe₇Ta₃ | 6.5 | — |
| Jeremejevite | Al₆(BO₃)₅F₃ | — | 3.18 g/cm³ |
| Ježekite | Na₈[(UO₂)(CO₃)₃](SO₄)₂·3H₂O | — | — |
| Jingsuiite | TiB₂ | — | 4.51 g/cm³ |
| Johnbaumite | Ca₅(AsO₄)₃OH | 4.5 | — |
| Johnkoivulaite-(Cs) | — | — | — |
| Jouravskite | Ca₃Mn₄+(SO₄)(CO₃)(OH)₆·12H₂O | — | — |
| Kahlenbergite | KAl₁₁O₁₇ | — | — |
| Kaliophilite | KAlSiO₄ | — | 2.54 g/cm³ |
| Kalsilite | KAlSiO₄ | — | 2.54 g/cm³ |
| Kambaldaite | NaNi₄(CO₃)₃(OH)₃ * 3H₂O | — | — |
| Kamiokite | Fe₂Mo₃O₈ | — | — |
| Khanneshite | (Na,Ca)₃(Ba,Sr,Ce,Ca)₃(CO₃)₅ | — | — |
| Kidodite | BaMg₂Fe₁₆O₂₇ | — | — |
| Kleinite | (Hg₂N)(Cl,SO₄)·nH₂O | — | — |
| Klockmannite | CuSe | — | 6.04 g/cm³ |
| Klöchite | (Fe²⁺Fe³⁺)☐₂KZn₃(Si₁₂O₃₀) | — | — |
| Kokchetavite | K(AlSi₃O₈) | — | 2.46 g/cm³ |
| Kopylovite | K₂Ti(Si₃O₉) | — | — |
| Kottenheimite | Ca₃Si(SO₄)₂(OH)₆·12H₂O | — | — |
| Koutekite | Cu₅As₂ | — | — |
| Krasheninnikovite | KNa₂CaMg(SO₄)₃F | — | — |
| Kufahrite | PtPb | — | 14.91 g/cm³ |
| Kyanoxalite | Na₇(Al₅-₆Si₆-₇O₂₄)(C₂O₄)₀.₅-₁.₀·5H₂O | — | — |
| Langisite | (Co,Ni)As | — | — |
| Laurelite | Pb₇F₁₂Cl₂ | — | — |
| Laurentthomasite | — | 6.0 | — |
| Lecoqite-(Y) | Na₃Y(CO₃)₃·6H₂O | — | — |
| Liottite | (Na,K)₁₆Ca₈(Al₆Si₆O₂₄)₃(SO₄)₅Cl₄ | — | — |
| Lishiite | (Ca₂◻)Sr₃(CO₃)₅ | — | — |
| Lonsdaleite | C | — | — |
| Lourenswalsite | (K,Ba)₂(Ti,Mg,Ca,Fe)₄(Si,Al,Fe)₆O₁₄(OH)₁₂ | — | — |
| Loveringite | (Ca,Ce,La)(Zr,Fe)(Mg,Fe)₂(Ti,Fe,Cr,Al)₁₈O₃₈ | 5.0 | 4.42 g/cm³ |
| Luanheite | Ag₃Hg | 2.5 | 12.50 g/cm³ |
| Lucabindiite | K(As₂O₃)₂Cl | — | — |
| Lukechangite-(Ce) | Na₃Ce₂(CO₃)₄F | — | — |
| Magnesiohongruiite-(Fe³⁺) | (Mg₂Fe³⁺)Fe³⁺NbO₇(OH) | — | — |
| Magnesiohögbomite-2N2S | — | — | — |
| Magnesiohögbomite-2N4S | [(Mg₈.₄₃Fe²⁺₁.₅₇)Σ=₁₀Al₂₂Ti⁴⁺₂O₄₆(OH)₂] | — | — |
| Magnesiotaaffeite-2N'2S | Mg₃BeAl₈O₁₆ | 8.0 | 3.60 g/cm³ |
| Majakite | PdNiAs | 6.0 | 9.33 g/cm³ |
| Majindeite | Mg₂Mo₃O₈ | — | — |
| Malinkoite | NaBSiO₄ | 7.0 | 2.96 g/cm³ |
| Mallestigite | Pb₃Sb₅+(SO₄)(AsO₄)(OH)₆ * 3H₂O | 4.0 | 4.91 g/cm³ |
| Mathewrogersite | Pb₇FeAl₃GeSi₁₂O₃₆(OH,H₂O)₆ | 2.0 | — |
| Mauriziodiniite | (NH₄)(As₂O₃)₂I | 1.0 | — |
| Maurogemmiite | Ti₁₀Fe₃O₃ | — | — |
| Mavlyanovite | Mn₅Si₃ | — | — |
| Mazzite-Mg | Mg₅(Si₂₆Al₁₀)O₇₂·30H₂O | — | — |
| Mazzite-Na | Na₈(Si₂₈Al₈)O₇₂·30H₂O | — | — |
| Megakalsilite | KAlSiO₄ | — | 2.54 g/cm³ |
| Menshikovite | Pd₃Ni₂As₃ | 5.0 | — |
| Merrihueite | (K,Na)₂(Fe²⁺,Mg)₅[Si₁₂O₃₀] | — | — |
| Metathénardite | — | — | — |
| Micheelsenite | (Ca,Y)₃Al(HPO₄,CO₃)(CO₃)(OH)₆ * 12H₂O | — | — |
| Microsommite | Na₄K₂Ca₂(SO₄)(Si₆Al₆O₂₄)Cl₂ | — | — |
| Milarite | KCa₂(Be₂AlSi₁₂O₃₀)·nH₂O | 6.0 | 2.60 g/cm³ |