metamorphic
Unakite Epidote Granite
Unakite (Rock composed of Orthoclase, Epidote, and Quartz)
Hardness: 6 to 7 on Mohs scale; Color: Mottled green (epidote), pink/orange (orthoclase), and gray/white (quartz); Luster: Vitreous to dull; Crystal structure: Phaneritic (crystalline mixture)
- Hardness
- 6 to 7 on Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6 to 7 on Mohs scale; Color: Mottled green (epidote), pink/orange (orthoclase), and gray/white (quartz); Luster: Vitreous to dull; Crystal structure: Phaneritic (crystalline mixture)
Formation & geological history
Formed through hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Proterozoic age formations.
Uses & applications
Popular for lapidary work, including cabochons, beads, and carvings. Also used as a decorative architectural stone and for metaphysical collecting.
Geological facts
Named after the Unaka Range in North Carolina, USA, where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive 'pistachio green' and 'salmon pink' color combination. Often found as water-worn pebbles in riverbeds or on beaches in glacial drift areas.
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