  Londonite-Rhodizite.  
Description from the source: 
Londonite-Rhodizite serie ( (Cs K Rb) Al4 Be4 (B Be)12 028 to Rb=0 for the pure Rhodizite cub.), Antandrokomby, Antsirabe`, Madagascar. Rich in rubidium example, with Tourmaline (probably Liddicoatite). 3,1x2,5x2 cm; 22 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 30 September, 2008 
Text Updated: 1 October, 2008 
Price: Trade 
Size: 1.25" 
Composition: (CsKRb)Al4Be4(BBe)12028
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