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This is a lovely shiny crystal of thorite, a rare radioactive mineral, from Mt. Zagi, Pakistan. The price reflects the rarity of this species more so than its beauty, though this one is really quite attractive.
Source: eBay seller 4jdk
Contributor: Theodore Gray
Acquired: 25 September, 2005
Price: $76
Size: 0.5"
Composition: (Th,U)SiO