metamorphic
Unakite
Altered Granite (Epidotized Granite)
Hardness: 6-7 on Mohs scale. Color: Mottled pink (orthoclase feldspar), green (epidote), and clear/white (quartz). Luster: Vitreous to dull. Crystal structure: Granular/phaneritic. Cleavage: Poor to distinct. Specific gravity: 2.6-3.0.
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled pink (orthoclase feldspar), green (epidote), and clear/white (quartz). Luster: Vitreous to dull. Crystal structure: Granular/phaneritic. Cleavage: Poor to distinct. Specific gravity: 2.6-3.0.
Formation & geological history
Formed by hydrothermal alteration of granitic rocks, where plagioclase feldspar is replaced by epidote, typically occurring in ancient mountain-building events or geothermal activity zones.
Uses & applications
Used for making cabochons, beads, small carvings, spheres, and ornamental lapidary items due to its appealing speckled pink and green color.
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 in the field by its distinct, colorful mosaic of pink orthoclase feldspar and green epidote. Commonly found in glacial drift derived from granitic terranes, such as the Great Lakes region.
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