metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray/white; Luster: Vitreous to dull; Crystal structure: Monoclinic and Trigonal components; Cleavage: None/Irregular; Specific Gravity: 2.85-3.20
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and gray/white
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray/white; Luster: Vitreous to dull; Crystal structure: Monoclinic and Trigonal components; Cleavage: None/Irregular; Specific Gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal alteration of granite, where plagioclase feldspar is replaced by epidote. It is associated with Precambrian orogenic events and metamorphic basement complexes.
Uses & applications
Commonly used for lapidary work, cabochons, beads, decorative carvings, architectural veneers, and as a popular stone for crystal healing and collecting.
Geological facts
It was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, from which it takes its name. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive pistachio-green (epidote) and salmon-pink (orthoclase) mottled appearance. It is frequently found as river stones in the Blue Ridge Mountains and along the shores of Lake Superior.
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