Learn about Dioptase
vivid emerald-green crystals with glassy luster, often on white calcite or quartz; highly collectible due to color, clarity, and brittleness.Opongguwe Prospect, Kaokoveld Plateau
A collector's guide to Opongguwe Prospect, Kaokoveld Plateau, Namibia: its geology, mining history and notable minerals, illustrated with the 40 specimens documented from this locality on EarthWonders.
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