metamorphic
Unakite
Unakite (Altered Granite)
Hardness: 6-7 Mohs; Color: Mottled green (epidote) and pink (orthoclase feldspar) with white/gray quartz; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: None visible in massive form.
- Hardness
- 6-7 Mohs
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled green (epidote) and pink (orthoclase feldspar) with white/gray quartz; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: None visible in massive form.
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic eras, found in riverbeds and glacial deposits.
Uses & applications
Commonly used as a lapidary stone for beads, cabochons, carvings, and decorative aggregate. It is also used as a architectural facing 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 the distinct 'pistachio green' and 'salmon pink' color combination. Look for it along river banks or beaches in the Appalachian mountains or areas with glacial till in the Great Lakes region.
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