igneous
Polished unakite pebble
Unakite; epidote-altered granite composed chiefly of epidote, pink feldspar, and quartz
AI-generated identification · may be incorrectOpaque, mottled salmon-pink, greenish-brown, and dark patches with a dull-to-waxy polish. Component minerals are about Mohs 6–7; the rock has a coarse, interlocking crystalline texture and no uniform cleavage.
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Physical properties
Opaque, mottled salmon-pink, greenish-brown, and dark patches with a dull-to-waxy polish. Component minerals are about Mohs 6–7; the rock has a coarse, interlocking crystalline texture and no uniform cleavage.
Formation & geological history
Forms when granite undergoes hydrothermal alteration, converting some feldspar to green epidote. The process occurs in varied geologic ages; the rounded form suggests water wear before polishing.
Uses & applications
Used for lapidary carvings, beads, decorative stones, and inexpensive jewelry.
Geological facts
Its contrasting pink feldspar and green epidote make unakite recognizable, though this pebble’s colors are muted and identification from an image is not certain.
Field identification & locations
Often found in gravel and stream deposits near altered granites; classic occurrences include the Unaka Mountains of North Carolina and Tennessee. Look for mottled pink-and-green crystalline texture rather than distinct mineral bands.
