metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mix; Cleavage: None/Irregular; Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs)
- Color
- Mottled green, pink, and gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mix; Cleavage: None/Irregular; Specific Gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. It is commonly associated with the Proterozoic eon.
Uses & applications
Mainly used as a semi-precious gemstone for jewelry, cabochons, beads, and decorative carvings. Also used as a construction aggregate or architectural stone.
Geological facts
Named after the Unaka Range in the Blue Ridge Mountains (USA) where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identified by its unique 'pistachio green' and 'salmon pink' color combination. Commonly found in riverbeds and as beach pebbles, particularly around the Great Lakes and the Blue Ridge Mountains.
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