igneous
Unakite
Granite (altered hydrothermal)
Hardness of 6 to 7 on the Mohs scale, distinct mottled pink (orthoclase feldspar), green (epidote), and clear/gray (quartz) coloration, vitreous luster, cryptocrystalline to phaneritic crystal structure, uneven fracture, specific gravity around 2.6 to 2.8.
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Physical properties
Hardness of 6 to 7 on the Mohs scale, distinct mottled pink (orthoclase feldspar), green (epidote), and clear/gray (quartz) coloration, vitreous luster, cryptocrystalline to phaneritic crystal structure, uneven fracture, specific gravity around 2.6 to 2.8.
Formation & geological history
Formed through hydrothermal alteration of granitic rocks, where hot water solutions alter the original plagioclase feldspar into epidote, occurring over millions of years in various orogenic and intrusive environments.
Uses & applications
Used primarily for making ornamental objects, cabochons, tumbled stones, beads, and sometimes in lapidary artwork or architectural decorative facings.
Geological facts
Unakite was first discovered in the Unaka Mountains of western North Carolina, which is where it gets its name. It is commonly found as glacial erratics and stream pebbles in regions glaciated during the Ice Age, fitting well with the geographic region provided near Lake Michigan.
Field identification & locations
Easily identified by its characteristic striking combination of pink feldspar and pistachio-green epidote. Often found as rounded pebbles along gravel bars, beaches, and glacial till deposits.
