metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs scale), Color: Mottled green (epidote) and pink (orthoclase), Luster: Dull to Vitreous, Crystal Structure: Monoclinic/Triclinic mixture, Cleavage: Poor, Specific Gravity: 2.85-3.20
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Mottled green (epidote) and pink (orthoclase), Luster: Dull to Vitreous, Crystal Structure: Monoclinic/Triclinic mixture, Cleavage: Poor, Specific Gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Found in ancient mountain belts.
Uses & applications
Used primarily as a gemstone for beads, cabochons, and decorative carvings. It is also used as a construction aggregate and architectural stone.
Geological facts
First discovered in the Unaka Range of North Carolina, after which it is named. It is unique among rocks for its distinct combination of opaque pink and green minerals.
Field identification & locations
Identify by its distinctive pistachio-green and pink mottled appearance. Common in riverbeds of the Blue Ridge Mountains; look for stones that take a high polish when wet.
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