metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green (pistachio) and pink (salmon); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic composite; Specific gravity: 2.85-3.00.
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green (pistachio) and pink (salmon)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green (pistachio) and pink (salmon); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic composite; Specific gravity: 2.85-3.00.
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase feldspar is replaced by green epidote, while orthoclase feldspar remains pink. Most specimens found today are from the Proterozoic era.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, architecture (as a building stone), and lapidary practice for beginners due to its hardness and stability.
Geological facts
It was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, which is how it earned its name. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive combination of pistachio-green epidote and salmon-pink orthoclase feldspar. Commonly found as river pebbles in the Blue Ridge Mountains and glacial drift in the Great Lakes region.
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