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/Trigonal (as a composite rock); 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/Trigonal (as a composite rock); Specific gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. It is commonly found in the Blue Ridge Mountains, USA, often in riverbeds as water-worn pebbles.
Uses & applications
Used primarily as a semi-precious gemstone for jewelry, cabochons, beads, and animal carvings. It is also used as an architectural stone and for decorative landscaping.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains (North Carolina/Tennessee), which is the source of its name. It is the state rock of Virginia.
Field identification & locations
Identify in the field by its distinct 'pistachio-green' and 'salmon-pink' mottled appearance. It is often found in glacial till or riverbeds. Collectors should look for balanced color distribution for higher quality specimens.
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