metamorphic
Unakite (or Epidote-rich Granite)
Unakite (Metamorphosed Granite consisting of Epidote, Orthoclase, and Quartz)
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic/Hexagonal components; Cleavage: Poor; Specific Gravity: 2.85-3.20
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic/Hexagonal components; Cleavage: Poor; Specific Gravity: 2.85-3.20
Formation & geological history
Formed through hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic tectonic events.
Uses & applications
Used primarily as a decorative stone, in lapidary for beads and cabochons, and as a semi-precious gemstone in jewelry and carvings.
Geological facts
It was first discovered in the Unaka Range of North Carolina, hence the name. It is the state rock of Virginia and is popular for metaphysical use as a grounding stone.
Field identification & locations
Look for the distinctive 'pistachio green' epidote mixed with 'salmon pink' orthoclase feldspar. Commonly found as river pebbles in areas with metamorphic basement rock.
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