metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Mixed/granular; Cleavage: None/Irregular; Specific Gravity: 2.85-3.00
- 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: Mixed/granular; Cleavage: None/Irregular; Specific Gravity: 2.85-3.00
Formation & geological history
Formed through the slow hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with the Precambrian or Paleozoic eras.
Uses & applications
Commonly used as a decorative stone, in lapidary work for cabochons and beads, as architectural stone, and as a popular semi-precious gemstone for jewelry.
Geological facts
Unakite was first discovered in the Unaka Range of North Carolina, USA, from which it derives its name. It is the state rock of Virginia.
Field identification & locations
Identified by its unique 'pistachio and ham' color combination of green epidote and pink orthoclase feldspar. Frequently found as river pebbles in areas with glacial outwash or near original mountain formations.
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