sedimentary
Rounded sedimentary pebble
Likely micritic limestone or calcareous sandstone
AI-generated identification · may be incorrectFine-grained, tan-gray, dull to weakly earthy luster, with rounded water-worn form and subtle pale mottling. Likely Mohs hardness 3–5; cleavage is absent or indistinct, and specific gravity is approximately 2.5–2.7.
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Physical properties
Fine-grained, tan-gray, dull to weakly earthy luster, with rounded water-worn form and subtle pale mottling. Likely Mohs hardness 3–5; cleavage is absent or indistinct, and specific gravity is approximately 2.5–2.7.
Formation & geological history
Formed from compacted carbonate mud or sand and later rounded by river, beach, or glacial transport; its exact geological age cannot be determined from the photograph.
Uses & applications
Commonly collected as a natural pebble or used decoratively in landscaping and crafts; it has little industrial value at this small size.
Geological facts
The pale patches may be carbonate grains, weathering, or tiny fossil fragments, but the image is insufficient for confident fossil identification.
Field identification & locations
Test an inconspicuous spot with vinegar or dilute hydrochloric acid: limestone fizzes, while sandstone usually does not. Common in streambeds, beaches, limestone regions, and glacial deposits; a fresh surface and hand lens would improve identification.
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