metamorphic
Unakite Epidosite Pebble
Epidotized Granite (Epidote-Albite-Quartz)
Hardness: 6-7 (Mohs), Color: Pistachio green with salmon-pink patches, Luster: Vitreous to dull, Crystal system: Monoclinic (Epidote) and Triclinic (Feldspar)
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Physical properties
Hardness: 6-7 (Mohs), Color: Pistachio green with salmon-pink patches, Luster: Vitreous to dull, Crystal system: Monoclinic (Epidote) and Triclinic (Feldspar)
Formation & geological history
Formed through hydrothermal metamorphism of granite where plagioclase is replaced by epidote. These specimens in the Great Lakes region are typically Proterozoic in age and were transported by glacial activity.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and decorative carvings. It is also used as a landscape stone or construction aggregate.
Geological facts
Unakite is named after the Unaka Range of mountains in North Carolina where it was first discovered, but it is frequently found as 'glacial drift' on the shores of Lake Michigan.
Field identification & locations
Identify it by the distinct mottled combination of green (epidote) and pink (orthoclase feldspar). In the field, look for smooth, water-worn pebbles on northern lake beaches.
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