metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and orange-red; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Cleavage: Poor; Specific gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and orange-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and orange-red; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Cleavage: Poor; Specific gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by green epidote. This process typically occurs in tectonic environments deep within the Earth's crust over millions of years.
Uses & applications
Commonly used as a decorative stone, for lapidary work such as beads, cabochons, and small sculptures. It is also used in construction as an ornamental aggregate and for architectural cladding.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina and Tennessee. It is often cited as the state rock of Virginia.
Field identification & locations
Identify in the field by its distinct 'pistachio' green and 'salmon' pink mottling. It is a common find in riverbeds and glacial till throughout the eastern United States and parts of South Africa and Brazil.
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