metamorphic
Unakite
Epidotized Granite
Hardness: 6 to 7 on Mohs scale; Color: Mottled green (epidote), pink (orthoclase), and gray/clear (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic and Trigonal (mixture); Specific gravity: 2.85 to 3.20.
- Hardness
- 6 to 7 on Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6 to 7 on Mohs scale; Color: Mottled green (epidote), pink (orthoclase), and gray/clear (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic and Trigonal (mixture); Specific gravity: 2.85 to 3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic geological ages in orogenic belts.
Uses & applications
Predominantly used as a lapidary stone for jewelry (cabochons, beads), decorative carvings, architectural veneers, and as an ornamental landscaping stone.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA. It is often considered a semi-precious gemstone due to its unique color contrast.
Field identification & locations
Identify in the field by its distinct 'pistachio' green and 'salmon' pink mottled appearance; it does not react to acid. Commonly found in the Blue Ridge Mountains (USA), South Africa, Sierra Leone, and Brazil.
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