metamorphic
Polished unakite pebble
Unakite: epidote–feldspar (commonly pink K-feldspar and green epidote), with quartz
AI-generated identification · may be incorrectOpaque, mottled salmon-pink and green, with a granular texture and polished surface; constituent minerals are typically Mohs 6–7, vitreous to dull, and crystalline. The image’s colors and pattern suggest unakite, though a photo cannot confirm the mineral makeup.
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Physical properties
Opaque, mottled salmon-pink and green, with a granular texture and polished surface; constituent minerals are typically Mohs 6–7, vitreous to dull, and crystalline. The image’s colors and pattern suggest unakite, though a photo cannot confirm the mineral makeup.
Formation & geological history
Formed when granite or related rock was altered by hydrothermal fluids, converting some feldspar to epidote; the rock is generally Precambrian in origin, with exact age depending on locality.
Uses & applications
Used for tumbled stones, beads, carvings, and decorative objects; occasionally used as an ornamental building stone.
Geological facts
Named after the Unaka Mountains of North Carolina and Tennessee, where it was first described.
Field identification & locations
Look for distinctive salmon-pink feldspar intergrown with pistachio-green epidote and quartz; it occurs in the Appalachian region and as transported pebbles. This specimen’s smooth shape suggests tumbling or water wear.
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