metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/salmon; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Cleavage: Poor/Irregular fracture.
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green and pink/salmon
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/salmon; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Cleavage: Poor/Irregular fracture.
Formation & geological history
Formed through the hydrothermal alteration of granite where plagioclase feldspar is replaced by epidote. Usually associated with Proterozoic orographic belts.
Uses & applications
Commonly used as a decorative stone, in lapidary work for cabochons and beads, and as an architectural facing stone. Used in metaphysical circles as a 'stone of vision'.
Geological facts
It was first discovered in the Unaka Range of North Carolina, from which it gets its name. It is a unique rock because it is a combination of three minerals: pink orthoclase feldspar, green epidote, and clear quartz.
Field identification & locations
Identify by the distinct 'pistachio' green and 'shrimp' pink color combination. Commonly found in river beds and lake shores (like Lake Superior) as glacial drift, or in situ in the Appalachian Mountains.
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