metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 Mohs; Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/grey (quartz); Luster: Vitreous to dull; Crystal Structure: Phaneritic/massive; Specific Gravity: 2.85-3.00
- Hardness
- 6-7 Mohs
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/grey (quartz); Luster: Vitreous to dull; Crystal Structure: Phaneritic/massive; Specific Gravity: 2.85-3.00
Formation & geological history
Formed through hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic metamorphic terrains.
Uses & applications
Commonly used for lapidary work, cabochons, decorative carvings, architectural trim, and as a semi-precious gemstone in beaded jewelry.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, for which it is named. It is the state rock of Virginia.
Field identification & locations
Identify in the field by its distinctive 'pistachio and ham' color combination. Commonly found in riverbeds and as glacial drift in the Great Lakes region and the Appalachian mountain range.
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