metamorphic
Unakite
Altered granite (Epidotized granite)
Hardness: 6-7 on Mohs scale. Color: Mottled green (epidote), pink (orthoclase feldspar), and white/clear (quartz). Luster: Vitreous to dull. Crystal structure: Granular. Cleavage: Poor to distinct.
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled green (epidote), pink (orthoclase feldspar), and white/clear (quartz). Luster: Vitreous to dull. Crystal structure: Granular. Cleavage: Poor to distinct.
Formation & geological history
Formed through the hydrothermal alteration of granitic rocks, where hot fluids alter plagioclase feldspar into epidote, typically occurring in metamorphic and metasomatic environments over millions of years.
Uses & applications
Used for making cabochons, beads, small carvings, spheres, and tumbled stones in lapidary arts.
Geological facts
Unakite was first discovered in the Unaka Mountains of western North Carolina, from which it gets its name. It is also found in the Blue Ridge Mountains.
Field identification & locations
Easily identified by its distinct combination of pink orthoclase feldspar and green epidote. Commonly found in glacial drift or stream beds derived from granitic source areas.
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