metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and orange-red; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Cleavage: Perfect in two directions; Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs)
- Color
- Mottled green, pink, and orange-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and orange-red; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Cleavage: Perfect in two directions; Specific Gravity: 2.85-3.20.
Formation & geological history
Formed through hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Often found in river beds or as glacial drift, particularly in the Blue Ridge Mountains of the USA.
Uses & applications
Mainly used as a semi-precious gemstone for cabochons, beads, and carvings. Also used in construction as an ornamental architectural stone and floor tiles.
Geological facts
Unakite was first discovered in the Unaka Mountains of North Carolina, from which it derives its name. It is the state rock of Virginia.
Field identification & locations
Identify by its unique 'pistachio and ham' appearance (mottled pink and green). Commonly found in riverbeds in Virginia and North Carolina, and as pebbles on the shores of Lake Superior.
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