metamorphic
Unakite (Epidosized Granite)
Unakite (composed of Epidote, Orthoclase, and Quartz)
Hardness: 6-7 Mohs; Color: Mottled green (epidote), pink (feldspar), and gray (quartz); Luster: Vitreous to dull; Structure: Granular/Massive; SG: 2.85-3.20.
- Hardness
- 6-7 Mohs
- Color
- Mottled green (epidote), pink (feldspar), and gray (quartz)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled green (epidote), pink (feldspar), and gray (quartz); Luster: Vitreous to dull; Structure: Granular/Massive; SG: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic geological eras.
Uses & applications
Mainly used as a decorative stone, in lapidary work for cabochons and beads, and as an architectural facing stone.
Geological facts
It is the state stone of Virginia, USA. It was named after the Unaka Range of the Blue Ridge Mountains where it was first discovered.
Field identification & locations
Look for the distinctive 'pistachio green' and 'salmon pink' mottled pattern. Commonly found in riverbeds where it has been washed down from mountain sources; highly concentrated in the Blue Ridge Mountains.
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