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: Phaneritic (medium to coarse grained); 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: Phaneritic (medium to coarse grained); Specific gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Found in mountainous regions, often in Precambrian basement rocks and associated with veins.
Uses & applications
Primarily used as a semi-precious gemstone for jewelry (cabochons, beads), decorative carvings, architectural stone, and as a popular specimen for lapidary work.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina/Tennessee, USA. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive 'pistachio green' and 'salmon pink' mottled appearance. It lacks the typical foliated structure of most metamorphic rocks, resembling granite but with a high green epidote content. Common in the Appalachian Mountains and glacial till near the Great Lakes.
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