metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs), Color: Mottled green, pink, and gray/white, Luster: Vitreous to dull, Crystal Structure: Monoclinic/Hexagonal (mixed), Cleavage: Indistinct, Specific Gravity: 2.85-3.26
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Physical properties
Hardness: 6-7 (Mohs), Color: Mottled green, pink, and gray/white, Luster: Vitreous to dull, Crystal Structure: Monoclinic/Hexagonal (mixed), Cleavage: Indistinct, Specific Gravity: 2.85-3.26
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Generally associated with ancient Precambrian tectonic events.
Uses & applications
Used primarily as a decorative stone, for cabochons in jewelry, carvings, beads, and architectural stone.
Geological facts
Named after the Unaka Range in the Appalachian Mountains of North Carolina and Tennessee where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify by the distinct mottled green (epidote) and pink (orthoclase feldspar) appearance. Commonly found as river pebbles in areas with metamorphic bedrock.
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