metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote), pink (orthoclase feldspar), and clear/grey (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Specific gravity: 2.85-3.20.
- 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/grey (quartz); Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; 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 ancient mountain-building events (Precambrian to Paleozoic).
Uses & applications
Commonly used as a semi-precious gemstone for jewelry (cabochons, beads), decorative carvings, lapidary practice, and occasionally as architectural stone.
Geological facts
It was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, from which it takes its name. It is the state rock of Virginia.
Field identification & locations
Identify by its unique 'pistachio green' and 'salmon pink' mottled appearance. Commonly found in riverbeds and beaches where glacial or fluvial action has transported it, particularly in the Blue Ridge Mountains and Lake Superior shores.
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