Minerals / Quartz, Amethyst var.

 This specimen of amethyst var. quartz, SiO₂ is very unremarkable in appearance, but is included, simply because it is listed in my mineral collection. The scalenahedral crystals are crisp, and unchipped. Amethyst quartz is coloured by irradiation, and trace amounts of iron. The origin of the specimen is unknown.  

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