metamorphic
Unakite
Epidotized Granite
Hardness: 6.0-7.0 (Mohs scale); Color: Mottled green (epidote) and pink/orange (orthoclase feldspar); Luster: Dull to vitreous; Crystal Structure: Monoclinic/Triclinic; Cleavage: Usually none observed in rock form; Specific Gravity: 2.85-3.20
- Hardness
- 6
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.0-7.0 (Mohs scale); Color: Mottled green (epidote) and pink/orange (orthoclase feldspar); Luster: Dull to vitreous; Crystal Structure: Monoclinic/Triclinic; Cleavage: Usually none observed in rock form; Specific Gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by pistachio-green epidote. This occurs in high-grade metamorphic belts or as veins in igneous rock.
Uses & applications
Primarily used as a semiprecious gemstone for beads, cabochons, and decorative carvings. It is also used in construction as an ornamental building stone or for landscape gravel.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA, which is where it gets its name. It is considered the state stone of Virginia.
Field identification & locations
Identify by its distinctive 'pistachio and salmon' color combination. It is frequently found as water-worn pebbles in riverbeds or on beaches in the Great Lakes region and the Appalachian Mountains. Collectors should look for a balanced distribution of pink and green.
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