sedimentary

Rounded greenish pebble

Indeterminate; possibly altered basalt, greenstone, or fine-grained serpentinite

AI-generated identification · may be incorrect

Dull olive-gray color, fine-grained texture, and subrounded water-worn shape; no visible crystals or cleavage. Estimated Mohs hardness 5–7 and specific gravity roughly 2.7–3.2, but testing is needed for confirmation.

Identified September 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely a naturally weathered and transported stream or beach pebble, possibly derived from mafic volcanic or metamorphic bedrock. Its geological age cannot be determined from the photograph.

Uses & applications

Primarily a curiosity, craft stone, or landscaping pebble; unattractive pieces generally have little jewelry or industrial value.

Geological facts

The green color may reflect chlorite, epidote, serpentine, or other alteration minerals. The shallow circular mark could be a weathering feature, indentation, or surface residue rather than a diagnostic structure.

Field identification & locations

Use a streak test, hardness test, magnet test, and dilute hydrochloric acid test; a fresh broken surface and loupe examination would improve identification. Similar pebbles occur in river gravels, beaches, and glacial deposits worldwide.