igneous
Unakite-like granitic pebble
Altered granite composed mainly of quartz, feldspar, and epidote; red areas may be potassium feldspar or iron-stained feldspar
AI-generated identification · may be incorrectTypically Mohs 6–7, opaque, white/green to pink-red, with a dull to weakly glassy luster and granular crystalline texture; no obvious cleavage as a whole rock. The specimen appears rounded and weathered, with red and dark mineral inclusions.
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Physical properties
Typically Mohs 6–7, opaque, white/green to pink-red, with a dull to weakly glassy luster and granular crystalline texture; no obvious cleavage as a whole rock. The specimen appears rounded and weathered, with red and dark mineral inclusions.
Formation & geological history
Likely formed as intrusive granite that underwent hydrothermal alteration, commonly producing epidote and pink feldspar; the pebble was later transported and rounded by erosion. Its exact geological age cannot be determined from the photograph.
Uses & applications
Used mainly as a decorative stone, lapidary material, cabochons, beads, and polished specimens; not generally a major construction stone in pebble form.
Geological facts
Classic unakite is pink-orange feldspar, green epidote, and quartz, whereas this specimen appears unusually white with red inclusions and may be a related altered granite or porphyritic rock.
Field identification & locations
Identify by its coarse interlocking grains, hardness, and contrasting feldspar/quartz/epidote-like patches; common in granitic terrains and glacial or river gravels. A hand lens and streak, hardness, or acid tests would improve identification.
