metamorphic
Unakite
Altered Granite (Epidotized Granite)
Hardness: 6-7 on the Mohs scale; Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/white (quartz); Luster: Vitreous to dull; Crystal structure: Triclinic and monoclinic mineral components; Cleavage: Good to distinct; Specific Gravity: 2.6 - 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 green (epidote), pink (orthoclase feldspar), and clear/white (quartz); Luster: Vitreous to dull; Crystal structure: Triclinic and monoclinic mineral components; Cleavage: Good to distinct; Specific Gravity: 2.6 - 3.0
Formation & geological history
Formed through the hydrothermal alteration of granitic rocks, where hot mineral-rich fluids alter the original feldspar and plagioclase into epidote, pink orthoclase, and quartz. Geological age varies widely depending on the deposit location, often associated with major mountain-building events.
Uses & applications
Commonly cut and polished into cabochons, beads, spheres, and ornamental items for jewelry and decorative art objects.
Geological facts
First discovered in the Unaka Mountains of western North Carolina, from which it derives its name. It is a composite rock rather than a single mineral.
Field identification & locations
Easily identified by its distinctive pink and green mottled appearance. Commonly found in glacial drift derived from granitic terranes, such as the Blue Ridge Mountains in the US and parts of South Africa, Brazil, and China.
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