sedimentary

Rounded pale pebble, likely limestone

Calcite-rich limestone (CaCO₃), identification tentative from appearance

AI-generated identification · may be incorrect

Cream-white, fine-grained, matte to slightly earthy luster, smoothly water-worn and subrounded; calcite hardness is Mohs 3, with indistinct cleavage in the massive rock. It should fizz with dilute hydrochloric acid or strong vinegar if calcitic.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely a naturally eroded limestone or calcareous pebble formed from compacted carbonate sediment, commonly ranging from Paleozoic to younger geological ages depending on source. Its rounded shape indicates transport by water or shoreline abrasion.

Uses & applications

Used as aggregate, cement and lime feedstock, building stone, and landscaping material; this small ordinary pebble has negligible jewelry or industrial value.

Geological facts

The image does not show diagnostic crystals or texture, so marble, chalk, dolostone, or a light-colored concrete fragment cannot be fully excluded without testing.

Field identification & locations

Check for acid effervescence, relatively low hardness, and a white powder streak; dolostone fizzes weakly and quartz does not. Common in limestone regions, streambeds, beaches, and glacial deposits.