igneous
Weathered greenish rock pebble
Possibly altered basalt or greenstone; exact identification is uncertain from the photograph
AI-generated identification · may be incorrectDull, mottled gray-green to brown, fine-grained, and rounded by weathering; no distinct crystals or cleavage are visible. Hardness and specific gravity cannot be determined reliably from the image.
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Physical properties
Dull, mottled gray-green to brown, fine-grained, and rounded by weathering; no distinct crystals or cleavage are visible. Hardness and specific gravity cannot be determined reliably from the image.
Formation & geological history
A likely mafic rock altered by fluids and later rounded by transport in water. Its age and original formation environment cannot be established visually.
Uses & applications
Likely a common field specimen with no evident commercial or jewelry use; value is negligible unless testing reveals a distinctive composition.
Geological facts
Green tones in mafic rocks can result from chlorite, epidote, or other alteration minerals, but color alone does not identify the rock.
Field identification & locations
The small rounded shape and fine texture fit a water-worn pebble. A fresh broken surface, hardness test, streak, and simple acid test would help distinguish basalt/greenstone from other common rocks.
