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- Gemstone (7411 bytes)
9: ...certain [[luminescence]] and a distinctive [[absorption spectrum]].
14: ...one beautiful or desirable are colour, unusual [[optical phenomena]] within the stone, an interesting ...
18: ...y in gem quality that they are scarcely known except to connoisseurs. Here are included andalusite, a...
103: [[pt:Gema (mineralogia)]]
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