metamorphic
Unakite (likely)
Unakite: epidote-altered granite composed chiefly of epidote, pink potassium feldspar, and quartz
AI-generated identification · may be incorrectMottled green and salmon-pink, granular, with a dull to vitreous luster; typical Mohs hardness is about 6–7. The rounded shape suggests it is a naturally water-worn pebble; identification from the image is not definitive.
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Physical properties
Mottled green and salmon-pink, granular, with a dull to vitreous luster; typical Mohs hardness is about 6–7. The rounded shape suggests it is a naturally water-worn pebble; identification from the image is not definitive.
Formation & geological history
Forms when granite undergoes hydrothermal alteration, converting some feldspar to green epidote; the source rock may be Precambrian, though the pebble’s age is unknown. Commonly exposed in mountain belts and carried into stream or beach gravels.
Uses & applications
Used as a decorative stone, tumbled material, cabochons, beads, and small carvings.
Geological facts
Unakite is named for the Unaka Mountains of North Carolina and Tennessee, where it was first described.
Field identification & locations
Look for the distinctive intergrowth of green epidote and salmon-pink feldspar, often with quartz; it is known from the eastern United States and occurs elsewhere. A loose pebble like this typically sells for about $1–$10, depending on size and finish.
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