Rb – Rubidium
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According to Mindat there are 13 known minerals containing Rubidium:
| [Cu5O2](AsO4)(VO4) · (Cu,K,Pb,Rb,Cs,)Cl | |
| (Cs,K,Rb)Al4Be4(B,Be)12O28 | |
| (K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2 | |
| Rb[B5O6(OH)4] · 2H2O | |
| Rb(AlSi3O8) | |
| (K,Rb)Al2(AlSi3O10)(OH)2 | |
| RbLi2AlSi4O10(F,OH)2 | |
| RbFe32+(Si3Al)O10(OH,F)2 | |
| KRbZnCl6 | |
| K-Rb-Cs-Cl | |
| K-Rb-Zn-Cl | |
| Rb2ZnCl4 | |
| Rb(LiAl1.5◻1.5)(Al0.5Si3.5)O10F2 |
From Wikipedia:
According to wikipedia –
Not too common, but at least one locality on every continent except for South America