metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs scale), Color: Mottled green and pink/salmon, Luster: Vitreous to dull, Crystal structure: Trigonal/Monoclinic/Amorphous mixture, Cleavage: None/Irregular fracture, Specific Gravity: 2.85-3.00
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Mottled green and pink/salmon, Luster: Vitreous to dull, Crystal structure: Trigonal/Monoclinic/Amorphous mixture, Cleavage: None/Irregular fracture, Specific Gravity: 2.85-3.00
Formation & geological history
Formed through the hydrothermal metamorphism of granite where plagioclase feldspar is replaced by epidote. It is commonly associated with Precambrian basement rocks.
Uses & applications
Used primarily as a gemstone for lapidary work, beads, cabochons, and decorative carvings. It is also used occasionally as an architectural facing stone.
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
Identifiable by its distinct combo of pistachio-green epidote and pink orthoclase feldspar. Commonly found in river beds and on beaches as eroded pebbles, particularly in the Blue Ridge Mountains and around the Great Lakes.
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