metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs); Color: Mottled green and pink/salmon; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Specific Gravity: 2.85-3.26.
- Hardness
- 6-7 (Mohs)
- Color
- Mottled green and pink/salmon
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green and pink/salmon; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Specific Gravity: 2.85-3.26.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Generally associated with ancient mountain-building events (often Precambrian age).
Uses & applications
Commonly used as a semi-precious stone for jewelry (cabochons, beads), decorative carvings, architectural facing stone, and as a popular lapidary material for tumbling.
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 common name.
Field identification & locations
Identify by its distinct 'pistachio' green epidote mixed with pink orthoclase feldspar. Frequently found as river pebbles in areas with Appalachian mountain drainage. It is the state rock of Virginia.
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