metamorphic
Unakite
Altered Granite (Epidotized Granite)
Hardness: 6-7 on the Mohs scale; Color: Mottled pink (orthoclase feldspar), green (epidote), and clear/gray (quartz); Luster: Vitreous to dull; Crystal structure: Massive/granular; Specific Gravity: 2.5-3.0
- Hardness
- 6-7 on the Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on the Mohs scale; Color: Mottled pink (orthoclase feldspar), green (epidote), and clear/gray (quartz); Luster: Vitreous to dull; Crystal structure: Massive/granular; Specific Gravity: 2.5-3.0
Formation & geological history
Formed through hydrothermal alteration of granite, where hot fluids alter the original minerals (plagioclase feldspar transforms into epidote).
Uses & applications
Commonly cut and polished into cabochons for jewelry, spheres, tiles, tumbled stones, and decorative lapidary items.
Geological facts
First discovered in the Unaka Mountains of North Carolina, from which it derives its name. It is a popular stone in lapidary arts due to its distinct pink and green color contrast.
Field identification & locations
Easily identified by its distinct mosaic of pink feldspar and green epidote. Found in regions with ancient granitic formations subject to hydrothermal activity, such as the Blue Ridge Mountains in the USA, South Africa, Brazil, and China.
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