metamorphic
Unakite
Altered Granite (Epidotized Granite)
Hardness: 6 - 7 on Mohs scale; Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/grayish (quartz); Luster: Vitreous to dull; Structure: Granular/massive.
- 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 clear/grayish (quartz); Luster: Vitreous to dull; Structure: Granular/massive.
Formation & geological history
Formed through hydrothermal metamorphism where plagioclase feldspar within granite is altered by fluorine- and calcium-rich fluids into green epidote, retaining pink orthoclase and quartz.
Uses & applications
Popular for lapidary arts, tumbling, cabochons, ornamental carvings, beads, and gemstone jewelry.
Geological facts
First discovered in the Unaka Mountains of western North Carolina and eastern Tennessee, USA, from which it derives its name.
Field identification & locations
Identified by its distinctive combination of pistachio-green epidote and salmon-pink orthoclase feldspar. Commonly found along stream beds, beaches (such as Lake Superior shores), and metamorphic regions.
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