metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7. Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/grey (quartz). Luster: Vitreous to dull. Crystal structure: None (massive aggregate). Cleavage: None (orthoclase has cleavage, but as a rock, unakite does not).
- Hardness
- 6-7
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7. Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/grey (quartz). Luster: Vitreous to dull. Crystal structure: None (massive aggregate). Cleavage: None (orthoclase has cleavage, but as a rock, unakite does not).
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. It is associated with Proterozoic terrains, often billions of years old.
Uses & applications
Primarily used as a semi-precious gemstone for cabochons, beads, carvings, and tumbled stones. It is also used in architectural trim and as a decorative stone.
Geological facts
Named after the Unaka Range of North Carolina, USA, where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify by its unique 'Christmas-like' combination of pistachio green and salmon pink. Commonly found in riverbeds and beaches in Virginia and the Great Lakes region. Collectors should look for balanced color distribution.
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