metamorphic
Unakite
Unakite (Metamorphosed granite)
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/orange; Luster: Vitreous to dull; Crystal Structure: Monoclinic/Triclinic; Cleavage: None/Irregular; Specific Gravity: 2.85-3.00
- 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/Triclinic; Cleavage: None/Irregular; Specific Gravity: 2.85-3.00
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase feldspar is replaced by epidote. Usually associated with the Precambrian-Proterozoic era.
Uses & applications
Used primarily as a semi-precious gemstone for jewelry (cabochons, beads), decorative carvings, architectural stone, and as a popular lapidary material.
Geological facts
Named after the Unaka Range in North Carolina, USA, where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identifiable by its unique 'Christmas-like' combination of pistachio green epidote and salmon-pink orthoclase feldspar. Common in river beds and shorelines in the Blue Ridge Mountains and Lake Superior.
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