metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/gray (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: None/Indistinct.
- Hardness
- 6-7 (Mohs scale)
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/gray (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic mixture; Cleavage: None/Indistinct.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by green epidote. Most common in Precambrian to Paleozoic geological formations.
Uses & applications
Commonly used as a semi-precious gemstone for jewelry (beads, cabochons), carvings, decorative architectural stone, and as a popular lapidary material for tumbling.
Geological facts
Unakite was first discovered in the Unaka Range of North Carolina, USA, from which it gets its name. It is the state rock of Virginia.
Field identification & locations
Identify by the distinct mottled green and pink patches. It is commonly found in river beds and lake shores, particularly in the Blue Ridge Mountains of the USA and the shores of Lake Superior inside glacial drift.
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