Apophyllite from Jensan Set. 
This sample represents oxygen 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: Jensan Scientifics 
Acquired: 17 March, 2003 
Price: Donated 
Size: 1" 
Composition: KCa4Si8O20(F,OH).8H2O + KCa4Si8O20(OH,F).8H2O
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