metamorphic
Unakite
Altered Granite (Epidotized Feldspar with Quartz)
AI-generated identification · may be incorrectHardness: 6 to 7 on the Mohs scale. Color: Mottled green (epidote) and pink/orange-red (orthoclase feldspar) with clear to grey quartz. Luster: Vitreous to dull. Cleavage: Poor in rock form. Specific gravity: 2.85–3.20.
- Hardness
- 6 to 7 on the Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6 to 7 on the Mohs scale. Color: Mottled green (epidote) and pink/orange-red (orthoclase feldspar) with clear to grey quartz. Luster: Vitreous to dull. Cleavage: Poor in rock form. Specific gravity: 2.85–3.20.
Formation & geological history
Formed through hydrothermal metamorphism where plagioclase feldspar in granite is altered by calcium-rich fluids into green epidote, retaining pink orthoclase feldspar and quartz.
Uses & applications
Used extensively as a lapidary stone for cabochons, beads, carvings, decorative sculptures, and ornamental stone tiles.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA, from which it derives its name.
Field identification & locations
Identified by its distinctive combination of pistachios-green epidote and salmon-pink feldspar. Commonly found in stream beds and metamorphic mountain belts worldwide.
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