metamorphic
Unakite
Altered Granite (Epidotized Granite)
Hardness: 6-7 on the Mohs scale. Color: Distinct mottled combination of pink (orthoclase feldspar), green (epidote), and clear/white (quartz). Luster: Vitreous to dull. Crystal structure: Granular/massive. Specific gravity: 2.55-2.85.
- 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: Distinct mottled combination of pink (orthoclase feldspar), green (epidote), and clear/white (quartz). Luster: Vitreous to dull. Crystal structure: Granular/massive. Specific gravity: 2.55-2.85.
Formation & geological history
Formed through hydrothermal alteration (epidotization) of preexisting granite, where hot fluids alter the original plagioclase feldspar into epidote and other minerals. Geological age varies widely based on the parent granite formation.
Uses & applications
Commonly used for lapidary work, carved into cabochons, beads, spheres, and decorative ornamental objects or jewelry.
Geological facts
Unakite was first discovered in the Unaka Mountains of western North Carolina, from which it derives its name. It is structurally a granite rock rather than a pure mineral.
Field identification & locations
Easily identified in the field by its striking mosaic of pink and pistachio-green colors. Found worldwide including the USA (North Carolina, Virginia), South Africa, Brazil, and China. Great for beginner and intermediate rockhounds.
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