igneous
Unakite Granite
Altered Granite (Quartz, Orthoclase Feldspar, Epidote)
AI-generated identification · may be incorrectHardness of 6-7 on the Mohs scale, with a mottled pink, green, and white coloration and vitreous luster. Composed primarily of pink orthoclase feldspar, clear quartz, and green epidote.
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Physical properties
Hardness of 6-7 on the Mohs scale, with a mottled pink, green, and white coloration and vitreous luster. Composed primarily of pink orthoclase feldspar, clear quartz, and green epidote.
Formation & geological history
Formed by hydrothermal alteration of granitic rocks, where hot water solutions alter the original feldspar and introduce epidote. Typically associated with continental collision zones and orogenic belts.
Uses & applications
Commonly cut and polished into cabochons, beads, spheres, and decorative architectural items like tiles or tabletops.
Geological facts
First discovered in the Unaka Mountains of North Carolina, from which it derives its name. The striking green patches are a result of calcium-aluminum-iron silicate infiltration.
Field identification & locations
Easily identified by its distinct pink and pistachio-green mottled appearance. Found worldwide including the USA, South Africa, and Brazil.
