metamorphic
Unakite pebble
Unakite; epidote–feldspar (pink orthoclase) granitoid
AI-generated identification · may be incorrectTypically Mohs 6–7; mottled pistachio-green epidote and pink feldspar with quartz, usually opaque and dull to vitreous. The image shows a rounded, waterworn pebble; mineral proportions and exact identity cannot be confirmed from appearance alone.
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Physical properties
Typically Mohs 6–7; mottled pistachio-green epidote and pink feldspar with quartz, usually opaque and dull to vitreous. The image shows a rounded, waterworn pebble; mineral proportions and exact identity cannot be confirmed from appearance alone.
Formation & geological history
Formed by hydrothermal alteration of granite, replacing some feldspar with epidote; the process occurred in ancient crystalline bedrock, with ages varying by locality. Erosion later rounded it into a pebble.
Uses & applications
Used for lapidary carvings, beads, cabochons, and decorative stone; rarely used as a dimension stone.
Geological facts
The name comes from the Unaka Mountains of the southeastern United States, where it was first described.
Field identification & locations
Look for distinctive green-and-salmon-pink mottling and a granular texture; common sources include the Appalachian region and glacial or stream deposits. A pebble-sized specimen like this is typically inexpensive.
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