metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and orange-red; Luster: Vitreous to dull; Crystal structure: Monoclinic and Triclinic components; Cleavage: None/Poor; 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 and Triclinic components; Cleavage: None/Poor; Specific gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal alteration of granite, where plagioclase feldspar is replaced by epidote. Many deposits are associated with the Precambrian Blue Ridge province.
Uses & applications
Used primarily as a lapidary stone for cabochons, beads, decorative carvings, and architectural tiles.
Geological facts
It was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, from which it derives its name.
Field identification & locations
Identify by the unique 'pistachio green' (epidote) and 'salmon pink' (orthoclase) coloration. Common in the Appalachian Mountains and as glacial drift in the Great Lakes region.
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