metamorphic
Unakite
Metamorphosed Granite (Epidotized Feldspar and Quartz)
Mohs hardness of 6 to 7. Distinctive mottled appearance of pistachio-green epidote, pink orthoclase feldspar, and clear-to-grayish quartz. Vitreous to dull luster. Specific gravity around 2.85 to 3.20.
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Physical properties
Mohs hardness of 6 to 7. Distinctive mottled appearance of pistachio-green epidote, pink orthoclase feldspar, and clear-to-grayish quartz. Vitreous to dull luster. Specific gravity around 2.85 to 3.20.
Formation & geological history
Formed through hydrothermal metamorphism of granitic rocks, where plagioclase feldspar is replaced by epidote while orthoclase feldspar and quartz remain intact.
Uses & applications
Popular as a lapidary material for lapidary carving, tumbled stones, beads, cabochons, and ornamental decorative objects.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina/Tennessee, USA, after which it was named.
Field identification & locations
Identified by its signature combination of mossy green and salmon pink colors. Commonly found in gravel beds, glacial till, and riverbeds in areas with altered granitic bedrock like the Appalachian Mountains and Lake Superior region.
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