metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink; Luster: Vitreous to dull; Crystal structure: Monoclinic (epidote) and Triclinic (feldspar); Specific gravity: 2.85-3.20
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green and pink
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink; Luster: Vitreous to dull; Crystal structure: Monoclinic (epidote) and Triclinic (feldspar); 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 found in areas of altered igneous rock.
Uses & applications
Predominantly used as a semiprecious gemstone for jewelry (beads, cabochons), architectural stones, and decorative carvings.
Geological facts
First discovered in the Unaka Range of North Carolina, USA, which is where it derives its name. It is the state rock of Virginia.
Field identification & locations
Identified by its unique 'pistachio and salmon' mottling. Collectors should look for balanced color distribution. It is most commonly found in river beds and lake shores in the Blue Ridge Mountains.
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