metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale), Color: Mottled pink and green, Luster: Vitreous to dull when unpolished, Crystal Structure: Trigonal/Monoclinic/Triclinic mixture, Cleavage: None/Irregular
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Mottled pink and green, Luster: Vitreous to dull when unpolished, Crystal Structure: Trigonal/Monoclinic/Triclinic mixture, Cleavage: None/Irregular
Formation & geological history
Formed through the hydrothermal alteration of granite where plagioclase feldspar is replaced by epidote. It is commonly associated with ancient Precambrian metamorphic belts.
Uses & applications
Used primarily as a decorative stone, semi-precious gemstone in jewelry (cabochons and beads), and for small carvings or architectural trimmings.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, which is how it earned its common name.
Field identification & locations
Identified by its unique combination of pistachio-green epidote and salmon-pink orthoclase feldspar. Common in the river valleys of Virginia and North Carolina.
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