
metamorphic
Unakite (likely)
Epidote–pink feldspar–quartz aggregate; commonly classified as altered granite
AI-generated identification · may be incorrectHardness about 6–7 Mohs; mottled pistachio-green, salmon-pink, and cream; generally opaque with a dull to weakly vitreous luster. Massive, granular, and lacking visible cleavage in the rounded specimen.
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Physical properties
Hardness about 6–7 Mohs; mottled pistachio-green, salmon-pink, and cream; generally opaque with a dull to weakly vitreous luster. Massive, granular, and lacking visible cleavage in the rounded specimen.
Formation & geological history
Forms when granite undergoes hydrothermal alteration, replacing dark minerals with green epidote while preserving pink orthoclase and quartz. It is mainly Paleozoic to Precambrian in age, depending on locality.
Uses & applications
Used as tumbled stone, cabochons, beads, carvings, and decorative aggregate; occasionally used for countertops and ornamental stone. Common specimens have modest collector value.
Geological facts
The name comes from the Unaka Mountains of Tennessee and North Carolina, where classic material occurs. The image’s color pattern is consistent with unakite, though similar epidote-rich rocks can look nearly identical.
Field identification & locations
Identify by the distinctive green-and-salmon mottling, granular texture, and lack of banding; it is commonly found in altered granitic terrains and river gravels. A polished surface shows stronger color contrast.
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