metamorphic
Unakite
Epidotized Granite (composition of Epidote, Orthoclase, and Quartz)
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote) and pink (orthoclase feldspar); Luster: Vitreous to dull; Crystal structure: Monoclinic and Trigonal components; Cleavage: None/Indistinct; Specific Gravity: 2.55-2.85
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green (epidote) and pink (orthoclase feldspar)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote) and pink (orthoclase feldspar); Luster: Vitreous to dull; Crystal structure: Monoclinic and Trigonal components; Cleavage: None/Indistinct; Specific Gravity: 2.55-2.85
Formation & geological history
Formed via hydrothermal metamorphism where granite is altered by hydrothermal fluids, converting plagioclase feldspar into epidote. Typically Proterozoic in age.
Uses & applications
Used primarily as a lapidary stone for beads, cabochons, carvings, and architectural accents. Also used as a decorative construction stone.
Geological facts
Unakite was first discovered in the Unaka Range of North Carolina, USA, for which it is named. It is a popular 'healing crystal' associated with emotional balance.
Field identification & locations
Easily identified by its unique mottled pink-and-green 'shrimp and broccoli' appearance. Found commonly in river beds and on beaches across the Blue Ridge Mountains and Lake Superior shores.
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