Facts
- Symbol
- Rb
- Atomic number
- 37
- Atomic mass
- 85.5 u
- Minerals
- 5
- Period
- 5
- Group
- 1
- Block
- s
- Melting point
- 312.5 °C
- Boiling point
- 960 °C
- Discovered
- 1861
Sources: Wikidata (CC0), IMA list of minerals via Wikidata · Wikidata Q895
Minerals containing this element · 5
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Aleutite | [Cu₅O₂](AsO₄)(VO₄)·(Cu,K,Pb,Rb,Cs,)Cl | Monoclinic | — | — |
| Masutomilite | (K,Rb)(Li,Mn³⁺,Al)₃(AlSi₃O₁₀)(F,OH)₂ | Monoclinic | — | — |
| Ramanite-(Rb) | RbB₅O₆(OH)₄·2H₂O | Orthorhombic | — | — |
| Rubicline | Rb(AlSi₃O₈) | Triclinic | 6.0 | — |
| Voloshinite | Rb(LiAl₁.₅☐₀.₅)(Al₀.₅Si₃.₅)O₁₀F₂ | Monoclinic | — | — |
Minerals named after it · 2
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Ramanite-(Rb) | RbB₅O₆(OH)₄·2H₂O | Orthorhombic | — | — |
| Rubicline | Rb(AlSi₃O₈) | Triclinic | 6.0 | — |