metamorphic
Unakite
Unakite (an altered granite composed of Epidote, Orthoclase, and Quartz)
Hardness: 6-7 on Mohs scale; Color: Mottled green (epidote), pink (orthoclase), and gray/clear (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Hexagonal components; Cleavage: None/Irregular
- Hardness
- 6-7 on Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Mottled green (epidote), pink (orthoclase), and gray/clear (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Hexagonal components; Cleavage: None/Irregular
Formation & geological history
Formed through hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Generally associated with Precambrian or Paleozoic geological ages.
Uses & applications
Commonly used as a decorative stone, for gemstone carvings, lapidary cabochons, beads for jewelry, and occasionally as architectural trim.
Geological facts
It was first discovered in the United States in the Unaka Range of the Blue Ridge Mountains in North Carolina, which is where it gets its name.
Field identification & locations
Identify in the field by its distinct 'pistachio' green and 'salmon' pink mottled appearance. Commonly found in riverbeds and glacial till in the Blue Ridge Mountains (USA), South Africa, and Brazil.
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