metamorphic
Unakite
Altered Granite (Epidotized Feldspar with Quartz)
Hardness: 6-7 on Mohs scale; Color: Mottled green (epidote) and pink/salmon (orthoclase feldspar) with clear to grey quartz; Luster: Dull to vitreous; Cleavage: Irregular/uneven fracture; Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 on Mohs scale
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Mottled green (epidote) and pink/salmon (orthoclase feldspar) with clear to grey quartz; Luster: Dull to vitreous; Cleavage: Irregular/uneven fracture; Specific Gravity: 2.85-3.20.
Formation & geological history
Formed through the metamorphic hydrothermal alteration of granite, where plagioclase feldspar is converted into epidote by metasomatic fluids rich in calcium, iron, and aluminum.
Uses & applications
Widely used as an ornamental stone, lapidary material for cabochons, beads, carvings, tumbled stones, and decorative floor/wall tiles.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA, which is where it derives its name. It is also the unofficial state stone of Virginia.
Field identification & locations
Easily identified by its distinctive combination of pistachio-green epidote and salmon-pink orthoclase feldspar. Commonly found in riverbeds, glacial deposits, and mountain ranges across eastern North America, South Africa, and Brazil.
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