metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Specific Gravity: 2.85-3.00
- Hardness
- 6-7 (Mohs)
- Color
- Mottled green, pink, and gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic (Epidote) and Triclinic (Feldspar); Specific Gravity: 2.85-3.00
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. Usually found in Proterozoic or Paleozoic age terrains.
Uses & applications
Primarily used as a lapidary stone for beads, cabochons, and decorative carvings. Also used as an architectural stone.
Geological facts
Unakite is named after the Unaka Range in North Carolina, USA, where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive combination of pistachio-green epidote and salmon-pink orthoclase feldspar. Common in river beds and on beaches near the Blue Ridge Mountains.
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