metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 Mohs; Color: Pink, green, and gray; Luster: Dull to vitreous; Crystal structure: Monoclinic/Triclinic; Specific gravity: 2.8-3.2
- Hardness
- 6-7 Mohs
- Color
- Pink, green, and gray
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, green, and gray; Luster: Dull to vitreous; Crystal structure: Monoclinic/Triclinic; Specific gravity: 2.8-3.2
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase feldspar is replaced by epidote. Primarily Precambrian in age.
Uses & applications
Used in lapidary work for cabochons, beads, and carvings; also used as an architectural stone and for decorative landscaping.
Geological facts
Named after the Unaka Range in the Blue Ridge Mountains where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify by the distinctive mottled green and pink appearance. Commonly found as pebbles in riverbeds or beaches where glacial activity or erosion has moved it from source outcrops.
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