metamorphic
Unakite
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. Usually found in Proterozoic or Paleozoic formations.
Uses & applications
Commonly used as a decorative stone, in lapidary for cabochons and beads, and as an architectural facing stone.
Geological facts
Named after the Unaka Range of the Blue Ridge Mountains in the United States, where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identified by its distinctive combination of pistachio-green epidote and pink orthoclase feldspar. Frequently found in riverbeds and pebble beaches near metamorphic mountain ranges.
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