metamorphic
Unakite
Altered Granite (Granitic Metamorphic Rock)
Hardness of 6-7 on the Mohs scale, characterized by a mottled green and pink/reddish color combination. Luster is vitreous to dull. It consists mainly of pink orthoclase feldspar, green epidote, and clear quartz.
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Physical properties
Hardness of 6-7 on the Mohs scale, characterized by a mottled green and pink/reddish color combination. Luster is vitreous to dull. It consists mainly of pink orthoclase feldspar, green epidote, and clear quartz.
Formation & geological history
Formed through the hydrothermal alteration (epidotization) of granite, where heated water alters the original minerals, replacing plagioclase feldspar with epidote.
Uses & applications
Used primarily for making cabochons, beads, carved decorative objects, and tumbled stones in the gemstone and lapidary arts.
Geological facts
First discovered in the Unaka Mountains of western North Carolina, from which it derives its name.
Field identification & locations
Easily identified visually by the distinct combination of pink feldspar and pistachio-green epidote. Commonly found in glacial drift and river gravels derived from granite-bearing mountain ranges.
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