metamorphic
Unakite Pebble
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Dull to vitreous; Structure: Massive/Granular; Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and gray
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Dull to vitreous; Structure: Massive/Granular; Specific Gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Often found in riverbeds as rounded pebbles.
Uses & applications
Used primarily as a semi-precious gemstone for cabochons, beads, and carvings. Also used as an architectural stone and for decorative gravel.
Geological facts
Unakite was first discovered in the Unaka Range of the Blue Ridge Mountains in the United States, which is where it gets its name.
Field identification & locations
Identify by its distinctive pistachio-green (epidote) and salmon-pink (orthoclase) coloration. Commonly found in riverbeds in the eastern US (Virginia/NC) and lake shores (Lake Superior).
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