metamorphic
Unakite
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: Primarily monoclinic and triclinic; Cleavage: Improper/none as a rock; Specific Gravity: 2.85-3.26.
- 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: Primarily monoclinic and triclinic; Cleavage: Improper/none as a rock; Specific Gravity: 2.85-3.26.
Formation & geological history
Formed through the hydrothermal alteration of granite where plagioclase feldspar is replaced by epidote. Many specimens date back to the Proterozoic era and are found in igneous/metamorphic basement complexes.
Uses & applications
Commonly used as a lapidary stone for beads, cabochons, and small carvings. It is also used as an architectural stone and for decorative gravel in landscaping.
Geological facts
Unakite was first discovered in the Unaka Range of the Appalachian Mountains in the United States, for which it is named. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive pistachio-green and salmon-pink mottled appearance. It is frequently found as river pebbles in areas with Appalachian drainage. Collectors should look for balanced color distribution.
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