metamorphic
Unakite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Dull to vitreous; Crystal structure: Massive; Cleavage: None/Poor; Specific gravity: 2.85-3.00
- 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; Crystal structure: Massive; Cleavage: None/Poor; Specific gravity: 2.85-3.00
Formation & geological history
Formed through the hydrothermal alteration of granite where plagioclase feldspar is replaced by epidote. Usually associated with Proterozoic-aged basement complexes.
Uses & applications
Commonly used as a decorative stone, in lapidary work for cabochons and beads, and as architectural facing or floor tiles.
Geological facts
Named after the Unaka Range of mountains in North Carolina, USA, where it was first discovered. It is often considered a semiprecious stone and is unique for containing both pink orthoclase and green epidote.
Field identification & locations
Identify by the distinct mottled combination of pistachio-green epidote and salmon-pink feldspar. Commonly found in river beds and shorelines (like Lake Superior) as glacial drift.
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