Quartz
Ohio Mine, The Amphitheater, Ouray Mining District, Ouray County, Colorado, USA
12.1 x 3.9 x 2.9 cm. This is an old-time quartz specimen that was in the Hauck and Caldwell College Collections. This is a fascinating crystal, because you can see two generations of growth. The original prism, with a sandy white coating, was later overgrown by milky quartz with a carpet of crystals on one side. There is a "window" that lets you ...
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