metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale), Color: Mottled green, pink, and orange-red, Luster: Dull to vitreous, Crystal structure: Granular/Massive, Cleavage: None, Specific gravity: 2.85-3.20
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Mottled green, pink, and orange-red, Luster: Dull to vitreous, Crystal structure: Granular/Massive, Cleavage: None, Specific gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Proterozoic age formations.
Uses & applications
Used primarily as a gemstone for beads and cabochons, decorative carvings, and occasionally as architectural stone.
Geological facts
First discovered in the Unaka Range of North Carolina, but can also be found as pebbles in glacial till throughout the Lake Superior region.
Field identification & locations
Identify by the unique 'pistachio green' epidote mixed with 'salmon pink' orthoclase feldspar and clear quartz. Commonly found in riverbeds and mountainous regions like the Appalachians.
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