igneous
Unakite
Altered Granite (Granitic rock composed of orthoclase feldspar, epidote, and quartz)
AI-generated identification · may be incorrectHardness of 6-7 on the Mohs scale, mottled green and pink color, vitreous to dull luster, massive crystal structure with no notable cleavage, specific gravity around 2.8-3.0.
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Physical properties
Hardness of 6-7 on the Mohs scale, mottled green and pink color, vitreous to dull luster, massive crystal structure with no notable cleavage, specific gravity around 2.8-3.0.
Formation & geological history
Formed through hydrothermal alteration of granitic rocks, where heated water alters original minerals like plagioclase into epidote.
Uses & applications
Primarily used as a lapidary material for cabochons, polished spheres, tumbled stones, and decorative carvings.
Geological facts
First discovered in the Unaka Mountains of North Carolina, from which it derives its name. The striking pink and green contrast makes it highly favored by amateur lapidaries.
Field identification & locations
Easily identified in the field by its distinct mottled mixture of pink feldspar and pistachio-green epidote. Commonly found in glacial drift derived from granite-rich regions.
