Pyrochlore from Jensan Set. 
This sample represents niobium in the "The Grand Tour of the Periodic Table" mineral collection from  Jensan Scientifics.  Visit my page about element collecting for a general description, or see photographs of all the samples from the set in a periodic table layout or with bigger pictures in numerical order.   
Source: Jensan Scientifics 
Contributor: Theodore Gray 
Acquired: 30 October, 2008 
Text Updated: 31 October, 2008 
Price: Anonymous 
Size: 1" 
Composition: (Ca,Na)2Nb2O6(OH,F)
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