Arsenic
Gottwald III Mine, Kladno, Kladno District, Central Bohemian Region, Czech Republic
Native arsenic is itself rare, but to have crystals of it makes this a true find. These very rare mm-size crystals have remarkably good form, luster, and a sort of steely-gray color. This is an important piece, for a native elements suite! It comes from Josef Vajdak, one of the recognized experts on the exceptionally interesting mineralogy of ...
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