Facts
- Symbol
- Cs
- Atomic number
- 55
- Atomic mass
- 132.9 u
- Minerals
- 27
- Period
- 6
- Group
- 1
- Block
- s
- Melting point
- 301.7 °C
- Boiling point
- 941.4 °C
- Discovered
- 1860
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q1108
Minerals containing this element · 27
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Aleutite | [Cu₅O₂](AsO₄)(VO₄)·(Cu,K,Pb,Rb,Cs,)Cl | Monoclinic | — | — |
| Caesiumpharmacosiderite | CsFe₄[(AsO₄)₃(OH)₄]·4H₂O | Cubic | — | — |
| Cesiodymite | CsKCu₅O(SO₄)₅ | Triclinic | — | — |
| Cesiokenopyrochlore | ☐ Nb₂(O,OH)₆Cs₁-x | Cubic | — | — |
| Cesplumtantite | (Cs,Na)₂(Pb,Sb³⁺)₃Ta₈O₂₄ | — | — | — |
| Galkhaite | (Hg₅Cu)CsAs₄S₁₂ | — | — | — |
| Garmite | CsLiMg₂(Si₄O₁₀)F₂ | Monoclinic | — | — |
| Gorbunovite | CsLi₂(Ti,Fe)Si₄O₁₀(F,OH,O)₂ | Monoclinic | — | — |
| Kirchhoffite | CsBSi₂O₆ | Tetragonal | — | 3.46 g/cm³ |
| Kreiterite | CsLi₂Fe³⁺(Si₄O₁₀)F₂ | Monoclinic | — | — |
| Kupletskite-(Cs) | Cs₂NaMn²⁺₇Ti₂(Si₄O₁₂)₂O₂(OH)₄F | — | — | — |
| Londonite | CsBe₅Al₄B₁₁O₂₈ | Cubic | — | — |
| Margaritasite | Cs₂(UO₂)₂(VO₄)₂·H₂O | Monoclinic | — | — |
| Mccrillisite | NaCs(Be,Li)Zr₂(PO₄)₄·1-2H₂O | — | — | — |
| Mendeleevite-(Ce) | Cs₆(REE₂₂Ca₆)(Si₇₀O₁₇₅)(OH,F)₁₄(H₂O)₂₁ | Cubic | — | — |
| Mendeleevite-(Nd) | Cs₆[(Nd,REE)₂₃Ca₇](Si₇₀O₁₇₅)(OH,F)₁₉(H₂O)₁₆ | Cubic | — | — |
| Nanpingite | CsAl₂(AlSi₃O₁₀)(OH,F)₂ | — | — | — |
| Odigitriaite | CsNa₅Ca₅[Si₁₄B₂O₃₈]F₂ | Monoclinic | — | — |
| Pautovite | CsFe₂S₃ | Orthorhombic | — | 3.61 g/cm³ |
| Pezzottaite-(Cs) | Cs(Be₂Li)Al₂(Si₆O₁₈) | Trigonal | 8.0 | — |
| Pollucite | Cs(Si₂Al)O₆·nH₂O | Cubic | 6.5 | 2.90 g/cm³ |
| Potassicmendeleevite-(Ce) | Cs₆K₆(REE₂₂Ca₆)(Si₇₀O₁₇₅)(OH,F)₂₀(H₂O)₁₅ | — | — | — |
| Ramanite-(Cs) | CsB₅O₆(OH)₄·2H₂O | Monoclinic | — | — |
| Senkevichite | CsKNaCa₂Ti[O|Si₇O₁₈(OH)] | — | — | — |
| Sokolovaite | CsLi₂Al(Si₄O₁₀)F₂ | — | — | — |
| Telyushenkoite | (Cs,Na,K)Na₆[Be₂Al₃Si₁₅O₃₉]F₂ | Trigonal | — | — |
| Zeravshanite | Na₂Cs₄Zr₃[Si₁₈O₄₅]*₂H₂O | Monoclinic | — | — |