metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6 to 7 on the Mohs scale. Color: Mottled green, pink, and gray/clear. Luster: Vitreous to dull. Crystal structure: Trigonal (epidote), Monoclinic (orthoclase), Hexagonal (quartz). Cleavage: None to poor. Specific gravity: 2.85 to 3.00.
- Hardness
- 6 to 7 on the Mohs scale
- Color
- Mottled green, pink, and gray/clear
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6 to 7 on the Mohs scale. Color: Mottled green, pink, and gray/clear. Luster: Vitreous to dull. Crystal structure: Trigonal (epidote), Monoclinic (orthoclase), Hexagonal (quartz). Cleavage: None to poor. Specific gravity: 2.85 to 3.00.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic geological ages in mountain belts.
Uses & applications
Commonly used as a decorative stone, for making cabochons, beads, and animal carvings in jewelry. Also used as an architectural stone for countertops and floor tiles.
Geological facts
It was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA, which is where it gets its name. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive pistachio-green (epidote) and salmon-pink (orthoclase) mottled appearance. Found in riverbeds and glacial drift in the Eastern United States, South Africa, and Brazil. It is easily polished and popular for lapidary beginners.
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