metamorphic
Unakite Epidote-Granite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (visible grains of epidote, orthoclase feldspar, and quartz); Specific gravity: 2.85-3.20
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and grey
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and grey; Luster: Vitreous to dull; Crystal structure: Phaneritic (visible grains of epidote, orthoclase feldspar, and quartz); Specific gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by green epidote. Often found in riverbeds as water-worn cobbles.
Uses & applications
Used as a semi-precious gemstone for cabochons, beads, and stone carvings. Also used in construction as an ornamental architectural stone and floor tiles.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, for which it is named. It is unique because it contains both original igneous minerals and metamorphic replacement minerals.
Field identification & locations
Identify by its distinctive pistachio-green and salmon-pink mottled appearance. Commonly found in North Carolina, Virginia, and the Lake Superior region. It is a popular stone for lapidary beginners because it takes a high polish.
