slushy: Mineral: AmethystColor: VioletCountry: North KoreaYear: 1995Amethyst 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.

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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.