metamorphic
Unakite
Unakite (Altered Granite)
Hardness: 6-7 Mohs; Color: Mottled green (epidote), pink (orthoclase), and gray (quartz); Luster: Vitreous to dull; Structure: Coarse-grained massive; Cleavage: None (fractures)
- Hardness
- 6-7 Mohs
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled green (epidote), pink (orthoclase), and gray (quartz); Luster: Vitreous to dull; Structure: Coarse-grained massive; Cleavage: None (fractures)
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Primarily found in the Blue Ridge Mountains of the USA.
Uses & applications
Used for lapidary work, cabochons, beads, decorative carvings, architectural facing, and as a popular semi-precious gemstone.
Geological facts
Named after the Unaka Range in North Carolina, USA, where it was first discovered. It is often used in jewelry because it takes a high polish.
Field identification & locations
Identifiable by its unique pistachio-green and salmon-pink mottled appearance. Commonly found as river pebbles in areas with granitic metamorphic bedrock.
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