metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs); Color: Distinctive mottled green, pink, and grey; Luster: Vitreous to dull; Crystal Structure: Monoclinic (epidote) and triclinic (feldspar); Cleavage: Uneven; Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs)
- Color
- Distinctive mottled green, pink, and grey
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Distinctive mottled green, pink, and grey; Luster: Vitreous to dull; Crystal Structure: Monoclinic (epidote) and triclinic (feldspar); Cleavage: Uneven; Specific Gravity: 2.85-3.20.
Formation & geological history
Formed via hydrothermal metamorphism where granite is altered. Plagioclase feldspar is replaced by green epidote, while orthoclase feldspar remains pink. Commonly associated with Precambrian geological ages.
Uses & applications
Used primarily as a semi-precious gemstone for jewelry (beads, cabochons), ornamental carvings, architectural stone, and as a popular stone for lapidary tumbling.
Geological facts
First discovered in the Unaka Range of North Carolina, USA, from which it derives its name. It is the state rock of Virginia.
Field identification & locations
Identify in the field by its 'pistachio green' color mottled with 'watermelon pink'. Commonly found in riverbeds and beaches in the Blue Ridge Mountains (USA) and Lake Superior. Collectors should look for a balance of pink and green with minimal grey quartz.
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