metamorphic
Unakite
Epidotized Granite
Hardness: 6-7 (Mohs scale), Color: Mottled green, pink, and orange-red, Luster: Vitreous to dull, Crystal Structure: Monoclinic (Epidote) and Triclinic (Feldspar), Cleavage: Indistinct, Specific Gravity: 2.85-3.20
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Mottled green, pink, and orange-red, Luster: Vitreous to dull, Crystal Structure: Monoclinic (Epidote) and Triclinic (Feldspar), Cleavage: Indistinct, Specific Gravity: 2.85-3.20
Formation & geological history
Formed through hydrothermal metasomatism where granite is altered by hot fluids, transforming plagioclase into epidote while preserving pink orthoclase feldspar and quartz. It is typically associated with Precambrian oroshies.
Uses & applications
Used predominantly as a lapidary stone for beads, cabochons, carvings, and decorative architectural stone. It is also used as an ornamental gravel and in jewelry making.
Geological facts
Named after the Unaka Range in the Blue Ridge Mountains of North Carolina/Tennessee, USA, where it was first discovered. It is often believed by crystal collectors to promote emotional balance.
Field identification & locations
Identified by its unique 'Christmas' color scheme of pink/red orthoclase and pistachio-green epidote. Commonly found in riverbeds and mountainous regions of the Appalachians and pebbles on the shores of Lake Superior.
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