metamorphic
Unakite (Epidote and Feldspar)
Unakite (modified granite composed of Epidote Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) and Orthoclase KAlSi3O8)
Hardness: 6-7 on Mohs scale; Color: Mottled green and pinkish-orange; Luster: Vitreous to dull; Crystal structure: Monoclinic; Cleavage: One direction (perfect); Specific Gravity: 2.8-3.2
- Hardness
- 6-7 on Mohs scale
- Color
- Mottled green and pinkish-orange
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Mottled green and pinkish-orange; Luster: Vitreous to dull; Crystal structure: Monoclinic; Cleavage: One direction (perfect); Specific Gravity: 2.8-3.2
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic geological ages.
Uses & applications
Used primarily as a gemstone for beads, cabochons, and decorative carvings. It is also used in architectural stone and construction aggregate when available in large quantities.
Geological facts
It was first discovered in the Unaka Range of North Carolina, USA, which is where it gets its name. It is commonly found as pebbles along the shores of Lake Superior and in river beds in Virginia.
Field identification & locations
Identify in the field by its distinct 'pistachio' green and 'salmon' pink mottling. It is a common find in riverbeds and on beaches in the Appalachian region and the Great Lakes. Collectors should look for balanced color distribution.
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