metamorphic
Unakite
Altered Granite (Granitic Metamorphic Rock)
Hardness: 6-7 on the Mohs scale; Color: Mottled green, pink, and white; Luster: Vitreous to dull; Crystal structure: Massive/granular aggregate; Cleavage: None distinct; Specific gravity: 2.5-3.0.
- Hardness
- 6-7 on the Mohs scale
- Color
- Mottled green, pink, and white
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on the Mohs scale; Color: Mottled green, pink, and white; Luster: Vitreous to dull; Crystal structure: Massive/granular aggregate; Cleavage: None distinct; Specific gravity: 2.5-3.0.
Formation & geological history
Formed through the hydrothermal alteration (epidotization) of granite, where plagioclase feldspar is replaced by epidote, typically occurring in ancient geological orogenic belts.
Uses & applications
Used primarily in lapidary work, carved decorative objects, cabochons for jewelry, and as a collectible tumbled stone.
Geological facts
Unakite was first discovered in the Unaka Mountains of western North Carolina, from which it derives its name. It is a composite rock consisting mainly of pink orthoclase feldspar, green epidote, and colorless quartz.
Field identification & locations
Easily identified by its distinctive pink and green coloration. Common localities include the United States (North Carolina, Virginia), South Africa, Brazil, and China.
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