metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/grey (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic/Hexagonal mix; Cleavage: None/Poor.
- Hardness
- 6-7 (Mohs scale)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/grey (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic/Hexagonal mix; Cleavage: None/Poor.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Original igneous components are altered by hot, mineral-rich fluids.
Uses & applications
Used primarily as a decorative stone, in jewelry (cabochons and beads), architectural trim, and as a popular stone for lapidary carving and metaphysical practices.
Geological facts
It 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
Identify by its unique combination of salmon-pink and pistachio-green patches. In the field, look for it in riverbeds or gravel pits in the Appalachian region and Lake Superior shores.
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