  Euxenite.  
Description from the source: 
Euxenite ( (Y Ca Ce U Th) (Nb Ta Ti)2 O6 orth.), Trout Creek Pass, Chafee Co. Colorado, USA. Crystal cluster, nice and rare example. 2x1,5x1 cm; 14 g with box. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 30 September, 2008 
Text Updated: 1 October, 2008 
Price: Trade 
Size: 0.75" 
Composition: (YCaCeUTh)(NbTaTi)2O6
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