metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and gray/white; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Specific Gravity: 2.55-2.85.
- Hardness
- 6-7 (Mohs)
- Color
- Mottled green, pink, and gray/white
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and gray/white; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Specific Gravity: 2.55-2.85.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidemic. Originally formed in Precambrian or Paleozoic deep-seated environments.
Uses & applications
Commonly used as a decorative stone, for jewelry (lapidary), architectural facings, and as a popular tumbling stone for collectors.
Geological facts
It was first discovered in the Unaka Range of North Carolina, USA, from which it takes its name. It is recognized as the state rock of Virginia.
Field identification & locations
Identify by its distinctive combination of pistachio-green epidote and salmon-pink orthoclase feldspar. Frequently found in riverbeds and on beaches in the Appalachian region and around the Great Lakes.
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