sedimentary

Weathered sandstone or limestone fragment

Likely quartz-rich sandstone or calcitic limestone; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Tan, porous, fine-grained, and dull to earthy in luster, with irregular weathering and a small cavity. Likely hardness 3–7 depending on composition; sandstone is commonly harder than calcitic limestone.

Identified August 13, 2026More sedimentary →

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Physical properties

Formation & geological history

A sedimentary rock formed from lithified sand grains or carbonate mud, probably deposited in an ancient shoreline, river, dune, or shallow-marine environment; its geological age cannot be determined visually.

Uses & applications

Commonly used as building stone, aggregate, paving, and decorative material; this small weathered piece has mainly educational or modest collecting value.

Geological facts

The cavity may represent a weathered-out grain, fossil fragment, or small vug. A drop of dilute hydrochloric acid will fizz strongly if the specimen is calcitic limestone but not ordinary quartz sandstone.

Field identification & locations

Look for visible quartz grains and gritty texture for sandstone; a powdery surface and acid reaction indicate limestone. Common worldwide, especially in sedimentary basins.