metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs); Color: Mottled green (epidote) and pink/orange (orthoclase) with clear/white quartz; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Opaque.
- Hardness
- 6-7 (Mohs)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green (epidote) and pink/orange (orthoclase) with clear/white quartz; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Opaque.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Often found in river beds or as Glacial drift.
Uses & applications
Commonly used for lapidary work including beads, cabochons, and small carvings. Also used occasionally as architectural stone or decorative gravel.
Geological facts
It was first discovered in the Unaka Range of North Carolina, from which it derives its name. It is the state rock of Virginia.
Field identification & locations
Identify by its unique pistachio-green and pink-salmon mottled appearance. Found in the Blue Ridge Mountains of the USA, South Africa, and Brazil. Collectors look for a balanced distribution of colors.
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