metamorphic
Unakite
Altered Granite (Plagioclase-Epidote-Quartz Rock)
Hardness: 6-7 on Mohs scale. Color: Mottled pink (orthoclase feldspar), green (epidote), and gray/clear (quartz). Luster: Vitreous to dull. Crystal Structure: Monoclinic/Triclinic coarse-grained aggregate.
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled pink (orthoclase feldspar), green (epidote), and gray/clear (quartz). Luster: Vitreous to dull. Crystal Structure: Monoclinic/Triclinic coarse-grained aggregate.
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase feldspar is transformed into green epidote by metasomatic alteration.
Uses & applications
Popular gemstone for lapidary work, cabochons, carved figurines, decorative tiles, architectural facings, and tumbling beads.
Geological facts
Unakite was first discovered in the Unaka Range of western North Carolina, USA, from which it gets its name. It is official state rock of Virginia.
Field identification & locations
Easily identified by its distinctive pistachio-green and pink mottled appearance. Commonly found in continental crustal environments, stream beds, and beach gravels.
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