metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic (epidote component); Specific gravity: 2.85-3.20
- Hardness
- 6-7 (Mohs)
- Color
- Mottled green, pink, and gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic (epidote component); Specific gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. It is commonly associated with the Precambrian Blue Ridge Mountains in the United States.
Uses & applications
Commonly used as a semi-precious gemstone for cabochons, beads, and stone carvings. Also used as an architectural stone and in construction as crushed aggregate.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA, from which it takes its name. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive 'pistachio' green and 'salmon' pink mottled appearance. Commonly found in riverbeds as water-worn pebbles in areas with granitic metamorphic basement rocks like Virginia and North Carolina.
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