metamorphic
Unakite
Altered Granite (Epidotized Granite)
Hardness 6-7 on Mohs scale. Distinctive mottled appearance of pistachio-green epidote, pink orthoclase feldspar, and clear-to-grey quartz. Vitreous to greasy luster. No prominent cleavage when whole, uneven fracture. Specific gravity around 2.85-3.20.
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Physical properties
Hardness 6-7 on Mohs scale. Distinctive mottled appearance of pistachio-green epidote, pink orthoclase feldspar, and clear-to-grey quartz. Vitreous to greasy luster. No prominent cleavage when whole, uneven fracture. Specific gravity around 2.85-3.20.
Formation & geological history
Formed through hydrothermal metamorphism where plagioclase feldspar in granite is altered by hydrothermal fluids into epidote, leaving pink orthoclase feldspar and quartz intact. Commonly found in ancient mountain ranges like the Blue Ridge Mountains.
Uses & applications
Popular lapidary material used for tumbling, beads, cabochons, carvings, and decorative tiles. Highly valued by rock collectors for its unique color combination.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA, from which it derives its name. It is also the state rock of Virginia.
Field identification & locations
Identified by its signature 'salmon pink and pistachio green' patchy color combination. Commonly found in riverbeds, glacial tills, and mountainous regions such as North Carolina, Virginia, South Africa, Brazil, and China.
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