metamorphic
Unakite
Unakite (Episyenite composition: Feldspar, Epidote, and Quartz)
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/orange; Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal system; Cleavage: None (fractures irregularly); Specific gravity: 2.85-3.20
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green and pink/orange
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/orange; Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal system; Cleavage: None (fractures irregularly); Specific gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by green epidote while orthoclase feldspar remains pink. Often found as pebbles and cobbles in glacial drift or stream beds.
Uses & applications
Primarily used as a semi-precious gemstone for jewelry (cabochons, beads), decorative carvings, architectural facing stone, and metaphysical healing practices.
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 in the field by its distinct 'pistachio green' and 'salmon pink' mottled appearance. Commonly found along the shores of Lake Superior and in the river valleys of Virginia/North Carolina. Collectors should look for balanced color distribution.
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