metamorphic
Unakite
Altered Granite (Epidotized Granite)
Hardness 6-7 on Mohs scale; distinctive pistachio-green and pinkish-orange/red mottling; vitreous to dull luster; massive to fine-grained texture; specific gravity 2.85-3.20.
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Physical properties
Hardness 6-7 on Mohs scale; distinctive pistachio-green and pinkish-orange/red mottling; vitreous to dull luster; massive to fine-grained texture; specific gravity 2.85-3.20.
Formation & geological history
Formed through hydrothermal metamorphism (epidotization) of granite, where plagioclase feldspar is converted into green epidote, while orthoclase feldspar (pink) and quartz remain.
Uses & applications
Popular gemstone for jewelry (beads, pendants, cabochons), ornamental carvings, lapidary projects, and architectural facings.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina/Tennessee, USA, from which it derives its name.
Field identification & locations
Identified by its signature combination of green epidote, pink orthoclase feldspar, and gray quartz. Commonly found in regions with ancient granitic mountain ranges, including Australia, South Africa, Brazil, and the USA.
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