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3D3DTerbium-doped glass.
A small impurity of terbium gives this glass its brilliant red color.
Source: eBay seller tranquil-gardens
Contributor: Theodore Gray
Acquired: 24 March, 2009
Text Updated: 24 March, 2009
Price: $2.50
Size: 0.75"
Purity: <1%
Terbium