metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 Mohs; Color: Mottled green, pink, and orange; Luster: Dull to vitreous; Structure: Phaneritic (crystalline); Cleavage: None (fractures irregularly); Specific gravity: 2.55-2.85.
- Hardness
- 6-7 Mohs
- Color
- Mottled green, pink, and orange
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled green, pink, and orange; Luster: Dull to vitreous; Structure: Phaneritic (crystalline); Cleavage: None (fractures irregularly); Specific gravity: 2.55-2.85.
Formation & geological history
Formed through hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Primarily found in Precambrian to Paleozoic terrains.
Uses & applications
Commonly used as a decorative stone, in lapidary work for cabochons and beads, and as an ornamental building stone.
Geological facts
Named after the Unaka Range of mountains in North Carolina, USA, where it was first discovered. It is often considered the state rock of Virginia.
Field identification & locations
Identified by its distinctive mottled pistachio-green (epidote) and salmon-pink (orthoclase) appearance. Frequently found as river pebbles in areas with glacial drift or near the Blue Ridge Mountains.
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