metamorphic
Unakite
Unakite-Epidote Granite
Hardness: 6-7 (Mohs scale), Color: Mottled pink and green, Luster: Vitreous to dull, Crystal Structure: Monoclinic and Trigonal components, Cleavage: Poor, Specific Gravity: 2.85-3.2
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Mottled pink and green, Luster: Vitreous to dull, Crystal Structure: Monoclinic and Trigonal components, Cleavage: Poor, Specific Gravity: 2.85-3.2
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidote. It is associated with Proterozoic age formations.
Uses & applications
Used primarily as a decorative stone for architectural facades, floor tiles, lapidary work (cabochons and beads), and as a gemstone for jewelry.
Geological facts
It was first discovered in the Unaka Range of the Blue Ridge Mountains in North Carolina, USA, from which it takes its name. It is the state rock of Virginia.
Field identification & locations
Identify by its distinctive combination of green epidote and pink orthoclase feldspar. Commonly found in river beds and beaches as pebbles, particularly in Virginia and around the Great Lakes.
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