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Tin oxide mineral.
| URLs | 
http://en.wikipedia.org/wiki/Cassiterite
 Cassiterite on Wikipedia  | 
| URLs | 
http://www.handbookofmineralogy.org/pdfs/Cassiterite.pdf
 Cassiterite mineral data  | 
| Materials | 
Tin Oxide
 Its principle use in ceramics is as an opacifier in glazes. It is very expensive.  | 
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