vivid emerald-green crystals with glassy luster, often on white calcite or quartz; highly collectible due to color, clarity, and brittleness.
Regional guide
Dioptase from Christmas Mine, Arizona, USA
from Christmas Mine, Arizona — emerald-green microcrystals with calcite contrast; a classic copper locality prized for provenance and character.
Locality guide
Christmas Mine
A collector's guide to Christmas Mine, USA: its geology, mining history and notable minerals, illustrated with the 45 specimens documented from this locality on EarthWonders.
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