sedimentary

Light-colored weathered stone, likely limestone

Calcite-dominated carbonate rock (CaCO₃); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Pale cream to gray, dull and strongly weathered, with rusty iron-oxide staining; likely Mohs hardness 3, nonmetallic luster, massive fine-grained texture, and weak/no visible cleavage. It may fizz with dilute hydrochloric acid or vinegar if calcitic.

Identified September 10, 2026More sedimentary →

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At a glance

Common name: Light-colored weathered stone, likely limestone
Scientific name: Calcite-dominated carbonate rock (CaCO₃); exact identification is uncertain from the image
Category: sedimentary
Identified: September 10, 2026
Method: Standard

AI Estimated Value

About $0–$5 as an ordinary loose stone; higher only if fossils, unusual textures, or documented provenance are present.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Likely formed from accumulated marine carbonate sediments that lithified into limestone, potentially millions to hundreds of millions of years ago, then became rounded by weathering or transport. The surface appears naturally worn rather than crystalline.

Uses & applications

Common limestone is used for crushed aggregate, cement and lime production, building stone, and soil treatment; this unremarkable specimen has little jewelry or collector value.

Geological facts

Limestone is primarily calcite and may contain fossils, dolomite, clay, or silica. Iron oxides create the orange-brown patches visible here.

Field identification & locations

Test with a steel nail (usually scratches it), inspect for fossil fragments, and apply dilute acid for effervescence; a positive reaction supports calcitic limestone. Common worldwide, especially in former shallow-marine regions.