Facts
- Symbol
- K
- Atomic number
- 19
- Atomic mass
- 39.1 u
- Minerals
- 559
- Period
- 4
- Group
- 1
- Block
- s
- Melting point
- 336.4 °C
- Boiling point
- 1,039 °C
- Discovered
- 1807
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q703
Minerals containing this element · 559
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Abernathyite | K(UO₂)(AsO₄)·3H₂O | Tetragonal | — | — |
| Achyrophanite | (K,Na)₃(Fe³⁺,Ti,Al,Mg)₅O₂(AsO₄)₅ | Orthorhombic | — | — |
| Acmonidesite | (NH₄,K,Pb)₈NaFe²⁺₄(SO₄)₅Cl₈ | Orthorhombic | — | — |
| Adolfpateraite | K(UO₂)(SO₄)(OH)(H₂O) | Monoclinic | — | — |
| Afghanite | (Na,K)₂₂Ca₁₀(Si₂₄Al₂₄)O₉₆(SO₄)₆Cl₆ | Trigonal | — | — |
| Agakhanovite-(Y) | YCa☐₂KBe₃Si₁₂O₃₀ | Hexagonal | 6.0 | — |
| Agricolaite | K₄(UO₂)(CO₃)₃ | Monoclinic | 4.0 | 3.53 g/cm³ |
| Agrinierite | K₂Ca[(UO₂)₃O₃(OH)₂]₂·5H₂O | Orthorhombic | — | — |
| Ajoite | K₃Cu²⁺₂₀Al₃Si₂₉O₇₆(OH)₁₆·8H₂O | Triclinic | — | — |
| Alcaparrosaite | K₃Ti⁴⁺Fe³⁺(SO₄)₄O(H₂O)₂ | Monoclinic | — | — |
| Aleksandrovite | KCa₇Sn₂Li₃Si₁₂O₃₆F₂ | Monoclinic | — | — |
| Aleutite | [Cu₅O₂](AsO₄)(VO₄)·(Cu,K,Pb,Rb,Cs,)Cl | Monoclinic | — | — |
| Alexkhomyakovite | K₆(Ca₂Na)(CO₃)₅Cl·6H₂O | Hexagonal | — | — |
| Alloriite | (Na,K,Ca)₂₄(Na,Ca)₄Ca₄(Si,Al)₄₈O₉₆(SO₄)₄(SO₃,CO₃)₂(OH,Cl)₂(H₂O,OH)₄ | Trigonal | — | — |
| Almarudite | K(☐,Na)₂(Mn,Fe,Mg)₂[(Be,Al)₃Si₁₂]O₃₀ | Hexagonal | 6.0 | 2.72 g/cm³ |
| Alsakharovite-Zn | NaSrKZn(Ti,Nb)₄(Si₄O₁₂)₂(O,OH)₄·7H₂O | Monoclinic | — | — |
| Altisite | Na₃K₆Ti₂Al₂Si₈O₂₆Cl₃ | Monoclinic | — | — |
| Alum-(K) | KAl(SO₄)₂·12H₂O | Cubic | — | — |
| Aluminoceladonite | K(Mg,Fe²⁺)Al(Si₄O₁₀)(OH)₂ | Monoclinic | — | — |
| Alumoedtollite | K₂NaCu₅AlO₂(AsO₄)₄ | Triclinic | — | — |
| Alumoklyuchevskite | K₃Cu²⁺₃AlO₂(SO₄)₄ | Triclinic | 2.5 | — |
| Alunite | KAl₃(SO₄)₂(OH)₆ | Trigonal | — | — |
| Alvesite | NaKZrSi₆O₁₅·2H₂O | Orthorhombic | — | — |
| Ambrinoite | [K,(NH₄)]₂(As,Sb)₆(Sb,As)₂S₁₃·H₂O | Triclinic | — | — |
| Amicite | K₂Na₂(Al₄Si₄O₁₆)·5H₂O | Monoclinic | 4.5 | — |
| Andrianovite | Na₁₂(K,Sr,Ce)₃Ca₆Mn₃Zr₃Nb(Si₂₅O₇₃)(O,H₂O,OH)₅ | Trigonal | — | — |
| Andyrobertsite | KCdCu₅(AsO₄)₄[As(OH)₂O₂]·2H₂O | Monoclinic | 3.0 | 4.01 g/cm³ |
| Antipinite | KNa₃Cu₂(C₂O₄)₄ | Triclinic | — | — |
| Aphthitalite | K₃Na(SO₄)₂ | Trigonal | 3.0 | 2.75 g/cm³ |
| Aqualite | (H₃O)₈(Na,K,Sr)₅Ca₆Zr₃Si₂₆O₆₆(OH)₉Cl | Trigonal | — | — |
| Arcanite | K₂[SO₄] | Orthorhombic | 2.0 | — |
| Archerite | H₂KPO₄ | Tetragonal | — | 2.39 g/cm³ |
| Armbrusterite | K₅Na₇Mn₁₅[(Si₉O₂₂)₄](OH)₁₀ * 4H₂O | Monoclinic | 3.5 | — |
| Arrojadite-(KFe) | {KNa}{Fe²⁺☐}{Ca}{Na₂☐}{Fe²⁺₁₃}{Al}(PO₄)₁₁(HPO₄)(OH)₂ | Monoclinic | — | — |
| Arrojadite-(KNa) | KNa₃(CaNa₂)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂ | Monoclinic | — | — |
| Arzamastsevite | K₆Al₅Si₆O₂₀(OH)₄Cl | Tetragonal | — | — |
| Ashcroftine-(Y) | K₅Na₅Y₁₂Si₂₈O₇₀(OH)₂(CO₃)₈·8H₂O | Tetragonal | — | — |
| Astrophyllite | K₂NaFe²⁺₇Ti₂Si₈O₂₈(OH)₄F | Triclinic | 3.0 | — |
| Atlasovite | K(BiO)Cu₆Fe³⁺(SO₄)₅O₃Cl | Tetragonal | — | — |
| Avdoninite | K₂Cu₅Cl₈(OH)₄·H₂O | Monoclinic | — | — |
| Avogadrite | KBF₄ | Orthorhombic | — | 2.63 g/cm³ |
| Balestraite | KLi₂V⁵⁺Si₄O₁₂ | Monoclinic | — | — |
| Balliranoite | (Na,K)₆Ca₂(Si₆Al₆O₂₄)Cl₂(CO₃) | Hexagonal | — | — |
| Bannisterite | (Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈ * nH₂O | — | 4.0 | — |
| Baratovite | KCa₇(Ti,Zr)₂Li₃Si₁₂O₃₆F₂ | Monoclinic | — | — |
| Barytolamprophyllite | (BaK)Ti₂Na₃Ti(Si₂O₇)₂O₂(OH)₂ | Monoclinic | — | — |
| Baylissite | K₂Mg(CO₃)₂·4H₂O | Monoclinic | — | — |
| Bellbergite | (K,Ba,Sr)₂Sr₂Ca₂(Ca,Na)₄(Si,Al)₃₆O₇₂·30H₂O | Hexagonal | — | — |
| Belomarinaite | KNa(SO₄) | Trigonal | — | — |
| Belousovite | KZn(SO₄)Cl | Monoclinic | — | — |
| Berezanskite | K☐₂Li₃(Ti,Zr,Sn)₂[Si₁₂O₃₀] | — | — | — |
| Biachellaite | (Na,Ca,K)₈(Si₆Al₆O₂₄)(SO₄)₂(OH)₀.₅·H₂O | Trigonal | — | — |
| Bicapite | [KNa₂Mg₂(H₂O)₂₅][H₂PV₅+₁₂O₄₀(V₅+O)₂] | — | — | — |
| Birnessite | (Na,Ca,K)₀.₆(Mn⁴⁺,Mn³⁺)₂O₄·(H₂O)₁.₅ | — | 1.5 | 1.50 g/cm³ |
| Bluestreakite | K₄Mg₂(V⁴⁺₂V⁵⁺₈O₂₈)·14H₂O | Monoclinic | 2.0 | — |
| Bobshannonite | KBaNa₂(Mn,Na)₈(Nb,Ti)₄(Si₂O₇)₄O₄(OH)₄(O,F)₂ | Triclinic | — | — |
| Boleite | KAg₉Pb₂₆Cu₂₄Cl₆₂(OH)₄₈ | Cubic | — | — |
| Boltwoodite | (K,Na)(UO₂)(SiO₃OH)·1.5H₂O | Monoclinic | — | — |
| Bonaccorsiite | KK₂Na₃(Al₆Si₃₆)O₈₄ | Hexagonal | — | — |
| Boromuscovite | KAl₂(BSi₃O₁₀)(OH)₂ | — | — | — |
Minerals named after it · 43
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Arrojadite-(KFe) | {KNa}{Fe²⁺☐}{Ca}{Na₂☐}{Fe²⁺₁₃}{Al}(PO₄)₁₁(HPO₄)(OH)₂ | Monoclinic | — | — |
| Arrojadite-(KNa) | KNa₃(CaNa₂)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂ | Monoclinic | — | — |
| Dachiardite-K | K₄(Si₂₀Al₄)O₄₈·13H₂O | Monoclinic | — | — |
| Erionite-K | K₁₀[Al₂₆Si₁₀O₇₂]·30H₂O | Hexagonal | — | — |
| Fenaksite | (K,Na)₄(Fe,Mn)₂(Si₄O₁₀)₂(OH,F) | — | — | — |
| Ferrierite-K | (K,Na)₅(Si₃₁Al₅)O₇₂·18H₂O | Orthorhombic | — | — |
| Gmelinite-K | K₄(Si₈Al₄)O₂₄·11H₂O | Hexagonal | — | — |
| Heulandite-K | (K,Ca,Na)₅(Si₂₇Al₉)O₇₂ · 26H₂O | Monoclinic | — | — |
| Ivanyukite-K | K₂[Ti₄O₂(OH)₂(SiO₄)₃]·9H₂O | Cubic | — | — |
| Kafehydrocyanite | — | Tetragonal | — | 1.98 g/cm³ |
| Kalborsite | K₆Al₄BSi₆O₂₀(OH)₄Cl | Tetragonal | — | — |
| Kaliborite | HKMg₂B₁₂O₁₆(OH)₁₀·4H₂O | Monoclinic | — | — |
| Kalicinite | KHCO₃ | Monoclinic | — | 2.23 g/cm³ |
| Kalifersite | (K,Na)₅Fe³⁺₇Si₂₀O₅₀(OH)₆ * 12H₂O | — | — | — |
| Kalinite | KAl(SO₄)₂·11H₂O | Monoclinic | — | — |
| Kaliochalcite | KCu₂(SO₄)₂[(OH)(H₂O)] | Monoclinic | 4.0 | 3.49 g/cm³ |
| Kaliophilite | KAlSiO₄ | Hexagonal | — | 2.54 g/cm³ |
| Kalsilite | KAlSiO₄ | Hexagonal | — | 2.54 g/cm³ |
| Katiarsite | KTiO(AsO₄) | Orthorhombic | — | 3.30 g/cm³ |
| Knasibfite | K₃Na₄(SiF₆)₃(BF₄) | Orthorhombic | — | — |
| Lemmleinite-K | Na₄K₈Ti₈(Si₄O₁₂)₄(OH,O)₈·8H₂O | — | — | — |
| Phillipsite-K | K₆(Si₁₀Al₆)O₃₂·12H₂O | Monoclinic | — | — |
| Potassic-arfvedsonite | KNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂ | Monoclinic | — | — |
| Potassic-chloro-hastingsite | KCa₂(Fe²⁺₄Fe³⁺)(Si₆Al₂)O₂₂Cl₂ | Monoclinic | 5.0 | — |
| Potassic-chloro-pargasite | KCa₂(Mg₄Al)(Si₆Al₂)O₂₂Cl₂ | Monoclinic | — | — |
| Potassic-ferri-leakeite | KNa₂(Mg₂Fe³⁺₂Li)Si₈O₂₂(OH)₂ | Monoclinic | 5.0 | — |
| Potassic-ferro-ferri-sadanagaite | KCa₂Fe²⁺₃Fe³⁺₂(Si₅Al₃)O₂₂(OH)₂ | Monoclinic | 5.8 | — |
| Potassic-ferro-ferri-taramite | K(NaCa)(Fe²⁺₃Fe³⁺₂)(Si₆Al₂)O₂₂(OH)₂ | Monoclinic | — | — |
| Potassic-ferro-pargasite | KCa₂(Fe²⁺₄Al)(Si₆Al₂)O₂₂(OH)₂ | Monoclinic | 6.0 | — |
| Potassic-ferro-sadanagaite | KCa₂(Fe²⁺₃Al₂)(Si₅Al₃)O₂₂(OH)₂ | Monoclinic | 6.0 | — |
| Potassic-ferro-taramite | K(NaCa)(Fe²⁺₃Al₂)(Si₆Al₂)O₂₂(OH)₂ | Monoclinic | — | — |
| Potassic-fluoro-hastingsite | KCa₂(Fe²⁺₄Fe³⁺)(Si₆Al₂)O₂₂F₂ | Monoclinic | 6.0 | — |
| Potassic-fluoro-pargasite | KCa₂(Mg₄Al)(Si₆Al₂)O₂₂F₂ | Monoclinic | — | — |
| Potassic-fluoro-richterite | K(NaCa)Mg₅Si₈O₂₂F₂ | Monoclinic | — | — |
| Potassic-magnesio-arfvedsonite | [K][Na₂][Mg₄Fe³⁺]Si₈O₂₂(OH)₂ | Monoclinic | — | — |
| Potassic-magnesio-fluoro-arfvedsonite | KNa₂(Mg₄Fe³⁺)Si₈O₂₂F₂ | Monoclinic | 6.0 | — |
| Potassic-magnesio-hastingsite | KCa₂(Mg₄Fe³⁺)(Si₆Al₂)O₂₂(OH)₂ | Monoclinic | — | — |
| Potassic-pargasite | KCa₂(Mg₄Al)(Si₆Al₂)O₂₂(OH)₂ | Monoclinic | — | — |
| Potassic-sadanagaite | KCa₂(Mg₃Al₂)(Si₅Al₃)O₂₂(OH)₂ | Monoclinic | 6.0 | — |
| Potassiccarpholite | (K,☐)(Li,Mn²⁺)₂Al₄(Si₂O₆)₂(OH,F)₈ | — | — | — |
| Potassicmendeleevite-(Ce) | Cs₆K₆(REE₂₂Ca₆)(Si₇₀O₁₇₅)(OH,F)₂₀(H₂O)₁₅ | — | — | — |
| Struvite-(K) | KMg(PO₄)·6H₂O | — | — | — |
| Tsepinite-K | (K,Ba,Na)₂(Ti,Nb)₂(Si₄O₁₂)(OH,O)₂·3H₂O | — | — | — |