metamorphic
Unakite
Altered Granite (Granitic Metamorphic Rock)
AI-generated identification · may be incorrectHardness of 6-7 on the Mohs scale, distinct mottled green and pink coloration, vitreous to dull luster, massive crystal structure with no significant cleavage.
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Physical properties
Hardness of 6-7 on the Mohs scale, distinct mottled green and pink coloration, vitreous to dull luster, massive crystal structure with no significant cleavage.
Formation & geological history
Formed through the hydrothermal alteration (epidotization) of granite, where plagioclase feldspar is replaced by epidote. Found globally in regions with significant ancient orogenic activity.
Uses & applications
Used primarily in lapidary work for making cabochons, beads, decorative spheres, and ornamental carvings.
Geological facts
First discovered in the Unaka Mountains of North Carolina, from which it derives its name. The striking pink and green contrast comes from orthoclase feldspar and green epidote.
Field identification & locations
Identified easily by the distinct polka-dot or mottled mix of pink feldspar, green epidote, and clear quartz. Common locations include the Blue Ridge Mountains and various glacial drift deposits.
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