metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs); Color: Pink (Orthoclase), Green (Epidote), and Gray/White (Quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Hexagonal mix; Cleavage: None/Poor; Specific gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs)
- Color
- Pink (Orthoclase), Green (Epidote), and Gray/White (Quartz)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Pink (Orthoclase), Green (Epidote), and Gray/White (Quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Hexagonal mix; Cleavage: None/Poor; Specific gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually associated with Precambrian or Paleozoic geological environments.
Uses & applications
Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, architectural facing, and as a popular stone for metaphysical or lapidary collecting.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA. It is unique because it is an altered form of granite that maintains its crystalline texture while changing mineral composition.
Field identification & locations
Identify by its distinctive 'pistachio and salmon' color combination. Commonly found in river beds as tumbled pebbles, especially in the Appalachian regions of the USA and also in South Africa and Brazil.
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