metamorphic
Unakit
Epidotized Granite
Hardness: 6-7 on the Mohs scale; Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/gray (quartz); Luster: Vitreous to dull; Crystal structure: Triclinic and monoclinic components; Cleavage: Distinct in feldspar; Specific gravity: 2.5-3.0
- Hardness
- 6-7 on the Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on the Mohs scale; Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/gray (quartz); Luster: Vitreous to dull; Crystal structure: Triclinic and monoclinic components; Cleavage: Distinct in feldspar; Specific gravity: 2.5-3.0
Formation & geological history
Formed through hydrothermal alteration (metamorphism) of granite, where hot fluids alter plagioclase feldspar into epidote, replacing it with green patches while leaving pink orthoclase and clear quartz intact.
Uses & applications
Used primarily as a decorative stone, tumbled stone, carved into cabochons for jewelry, and in ornamental architectural applications.
Geological facts
Unakite was first discovered in the Unaka Mountains of North Carolina, which is how it got its name. It is commonly found in glacial drift pebbles and cobbles.
Field identification & locations
Easily identified in the field by its distinct, colorful combination of salmon-pink feldspar and pistachio-green epidote. Found globally including in the United States, South Africa, Brazil, and China.
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