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3D3DMonazite Crystal.
This is a lustrous crystal of monazite from Kitsamby, Madagascar. Rare, expensive, and radioactive: What more could you ask of a mineral?
Source: eBay seller mineralman999
Contributor: Theodore Gray
Acquired: 20 September, 2005
Price: $140
Size: 1.5"
Composition: (Ce,La,Nd,Th)PO4