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3D3DBismuth Germanate crystal.
Bismuth germanate crystals like this one are used in scintillation detectors.
Source: eBay seller mc17cyclotron
Contributor: Theodore Gray
Acquired: 2 April, 2009
Text Updated: 3 April, 2009
Price: $40
Size: 1.5"
Composition: Bi4Ge3O12
Bismuth