  Sulphohalite.  
Description from the source: 
Sulphohalite ( Na6 (SO4)2 F Cl cub.), Searles Lake, California, USA. Perfect octahedral crystal, much better than the photo, rare. 2x1,8x1,5 cm; 12 g with box. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 26 October, 2008 
Text Updated: 26 October, 2008 
Price: Trade 
Size: 0.75" 
Composition: Na6(SO4)2FCl
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