metamorphic
Unakite
Altered granite (Epidotized granite)
AI-generated identification · may be incorrectHardness of 6-7 on the Mohs scale, characterized by a distinct mottled pink orthoclase feldspar, green epidote, and clear quartz. It exhibits a vitreous to dull luster and massive crystal structure.
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Physical properties
Hardness of 6-7 on the Mohs scale, characterized by a distinct mottled pink orthoclase feldspar, green epidote, and clear quartz. It exhibits a vitreous to dull luster and massive crystal structure.
Formation & geological history
Formed through hydrothermal alteration of granite, where hot fluids transform plagioclase feldspar into epidote. Typically found in association with granitic orogenic belts.
Uses & applications
Widely used as a lapidary material for cabochons, polished spheres, tumbled stones, and decorative architectural tiles.
Geological facts
First discovered in the Unaka Mountains of North Carolina, from which it derives its name. The striking green and pink color combination makes it a favorite among amateur rockhounds.
Field identification & locations
Easily identified in the field by its distinct patchy coloration of pink feldspar and pistachio-green epidote. Commonly sourced from the Blue Ridge Mountains and various glacial drift deposits worldwide.
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