metamorphic
Unakite Granitoid
Unakite (Metasomatized Granite)
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase), and gray (quartz); Luster: Vitreous to dull; Crystal structure: Phaneritic/Granular; Specific Gravity: 2.85-3.00
- Hardness
- 6-7 (Mohs scale)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase), and gray (quartz); Luster: Vitreous to dull; Crystal structure: Phaneritic/Granular; Specific Gravity: 2.85-3.00
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase is replaced by epidote. These typically date back to the Proterozoic era and form in deep continental crust environments.
Uses & applications
Used as a decorative stone, in lapidary work for cabochons and beads, as architectural stone, and as a popular healing stone in metaphysical circles.
Geological facts
Named after the Unaka Range of North Carolina where it was first discovered. It is the state rock of Virginia. Its unique appearance comes from the specific combination of three distinct minerals.
Field identification & locations
Identify by its distinct 'pistachio' green and salmon pink mottling. Commonly found in riverbeds and beach gravels in the Appalachian Mountains and the Great Lakes region after glacial transport.
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