metamorphic
Unakite
Altered Granite (Epidote-bearing Granitic Rock)
Mohs hardness of 6 to 7; mottled appearance with pink orthoclase feldspar, green epidote, and clear or milky quartz; vitreous to dull luster; massive crystal structure; specific gravity around 2.6 to 2.8.
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Physical properties
Mohs hardness of 6 to 7; mottled appearance with pink orthoclase feldspar, green epidote, and clear or milky quartz; vitreous to dull luster; massive crystal structure; specific gravity around 2.6 to 2.8.
Formation & geological history
Formed through the hydrothermal alteration (metasomatism) of granite, where hot fluids alter original minerals like plagioclase feldspar into epidote.
Uses & applications
Used for making cabochons, polished decorative objects, beads, spheres, and as a tumbling stone in lapidary arts.
Geological facts
Unakite was first discovered in the Unaka Mountains of North Carolina, from which it derives its name.
Field identification & locations
Easily identified by its distinct mosaic of pink and green colors. Commonly found in glacial drift derived from granitic terrines, such as the Blue Ridge Mountains in the USA.
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