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Amethyst - North Korea - 1995

Par stephane • Minerals • Tuesday 14/04/2009 • 0 commentaires • Version imprimable

Amethyst from North Korea
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Amethyst crystals from North Korea. The stamp mentions the chemical formula of Silica (SiO2). Quartz (and Amethyst, the violet type of Quartz) is a type of Silica.