mineral

Weathered gray-green pebble

Indeterminate; possibly altered basalt, serpentinite, or a greenish metamorphic rock

AI-generated identification · may be incorrect

Fine-grained, rounded and weathered, with dull gray-green to brown coloration and low luster; hardness and cleavage are not reliably visible. No distinct crystals or diagnostic banding can be confirmed from the image.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally worn stream, beach, or glacial pebble formed from an older igneous or metamorphic source; its geological age cannot be determined visually.

Uses & applications

Primarily a collecting or curiosity specimen; no reliable industrial or jewelry use can be assigned without mineral identification.

Geological facts

The brown surface may represent iron-oxide weathering, while the green-gray interior could reflect mafic minerals or alteration. A streak, hardness, magnetism, and specific-gravity test would help distinguish candidates.

Field identification & locations

Common possibilities include basalt, serpentinite, greenstone, or chlorite-rich rock. Inspect fresh broken surfaces, test hardness against glass, check for magnetism, and use a hand lens; locality information is especially important.