metamorphic
Unakite Granite
Unakite (Epidotized Granite)
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Coarse-grained phaneritic; Cleavage: None (fractures irregularly); Specific gravity: 2.55-2.85
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Coarse-grained phaneritic; Cleavage: None (fractures irregularly); Specific gravity: 2.55-2.85
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. It is typically associated with the Proterozoic Era, found in orogenic belts.
Uses & applications
Used as a semi-precious gemstone for cabochons, beads, and carvings. Also used as architectual stone, floor tiles, and in landscaping.
Geological facts
Named after the Unaka Range of North Carolina, USA, where it was first discovered. It is considered a symbol of 'growing together' in metaphysical circles due to its blended colors.
Field identification & locations
Identify in the field by the distinct combination of pistachio-green epidote and salmon-pink orthoclase feldspar. Commonly found in riverbeds and glacial tills in the Blue Ridge Mountains and around the Great Lakes.
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