metamorphic
Unakite
Unakite (Metasomatized Granodiorite)
Hardness: 6-7 Mohs; Color: Mottled green, pink, and gray/white; Luster: Vitreous to dull; Crystal structure: Monoclinic and Hexagonal; Specific gravity: 2.8-3.2
- Hardness
- 6-7 Mohs
- Color
- Mottled green, pink, and gray/white
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled green, pink, and gray/white; Luster: Vitreous to dull; Crystal structure: Monoclinic and Hexagonal; Specific gravity: 2.8-3.2
Formation & geological history
Formed through the hydrothermal metamorphism (metasomatism) of granite, where plagioclase feldspar is replaced by epidote. Usually identified in Proterozoic aged bedrock.
Uses & applications
Primarily used as a semi-precious gemstone for cabochons, beads, and carvings. Also used as architectural stone and in landscaping.
Geological facts
It was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, from which it takes its name. It is the state rock of Virginia.
Field identification & locations
Identify by the distinct pistachio-green epidote mixed with pink orthoclase feldspar. Commonly found as river pebbles in the Blue Ridge Mountains and glacial drift in the Great Lakes region.
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