metamorphic
Unakite
Altered Granite (Epidotized Granite)
Hardness: 6-7 on the Mohs scale; Color: Mottled green, pink, and white; Luster: Vitreous to dull; Crystal structure: Triclinic and monoclinic (aggregate of multiple minerals); Cleavage: Distinct in feldspar components; Specific gravity: 2.55-2.85
- 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: Triclinic and monoclinic (aggregate of multiple minerals); Cleavage: Distinct in feldspar components; Specific gravity: 2.55-2.85
Formation & geological history
Formed through the hydrothermal alteration (epidotization) of granite, where plagioclase feldspar is replaced by epidote, typically associated with orogenic events and cooling magma bodies.
Uses & applications
Used primarily as a decorative stone for cabochons, beads, sphere carving, tumbled stones, and architectural accents or lapidary items.
Geological facts
Unakite was first discovered in the Unaka Mountains of western North Carolina, from which it derives its name. It often contains pink orthoclase feldspar, green epidote, and clear quartz.
Field identification & locations
Easily identified by its distinctive pink and green mottled appearance. Commonly found in glacial drift derived from the Blue Ridge Mountains in the United States, as well as South Africa, Brazil, and China.
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