metamorphic
Unakite
Altered Granite (Epidote, Orthoclase Feldspar, Quartz)
Hardness of 6 to 7 on the Mohs scale, colors ranging from mottled pink and green, vitreous to dull luster, cryptocrystalline to microcrystalline structure, no distinct cleavage, and a specific gravity of around 2.8 to 3.0.
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Physical properties
Hardness of 6 to 7 on the Mohs scale, colors ranging from mottled pink and green, vitreous to dull luster, cryptocrystalline to microcrystalline structure, no distinct cleavage, and a specific gravity of around 2.8 to 3.0.
Formation & geological history
Formed by hydrothermal alteration of granitic rocks, where plagioclase feldspar is altered to epidote, resulting in a metamorphic rock composed mainly of pink orthoclase feldspar, green epidote, and colorless quartz.
Uses & applications
Commonly used for lapidary work, carved into tumbled stones, spheres, cabochons for jewelry, and ornamental decorative objects.
Geological facts
Unakite was first discovered in the Unaka Mountains of western North Carolina, from which it derives its name.
Field identification & locations
Easily identified by its distinct mottled pink and green coloration caused by the combination of pink feldspar and green epidote. It is found worldwide in regions with granitic rock formations affected by hydrothermal activity.
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