metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Green (epidote), Pink (orthoclase), and Clear/Grey (quartz); Luster: Vitreous to dull; Structure: Granular/Massive.
- Hardness
- 6-7 (Mohs scale)
- Color
- Green (epidote), Pink (orthoclase), and Clear/Grey (quartz)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Green (epidote), Pink (orthoclase), and Clear/Grey (quartz); Luster: Vitreous to dull; Structure: Granular/Massive.
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase feldspar is replaced by epidote. Can be from the Proterozoic era to more recent geological periods.
Uses & applications
Used as a semi-precious gemstone in jewelry (cabochons, beads), decorative carvings, and as a popular lapidary material for tumblers.
Geological facts
Named after the Unaka Range in the Blue Ridge Mountains of the United States where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify by the distinct mottled green and pink appearance. Commonly found in river beds and lake shores (like Lake Superior) as glacial drift, or in mountain ranges like the Appalachians.
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