sedimentary

Tumbled limestone or calcite-rich stone

Limestone, predominantly calcite (CaCO₃); exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

Cream to tan, dull-to-waxy luster, rounded and polished surface with irregular layering or vein-like fractures; calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.7. It should fizz with dilute hydrochloric acid or strong vinegar if calcitic.

Identified August 13, 2026More sedimentary →

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At a glance

Common name: Tumbled limestone or calcite-rich stone
Scientific name: Limestone, predominantly calcite (CaCO₃); exact identification is uncertain from the photograph
Category: sedimentary
Identified: August 13, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 as a common tumbled specimen; more if fossiliferous, unusually patterned, or confirmed as a collectible mineral.

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 compacted marine carbonate sediments or precipitated carbonate, commonly ranging from Paleozoic to Cenozoic age, then shaped by natural abrasion or tumbling. The visible bands may reflect bedding, recrystallization, or weathering.

Uses & applications

Used as aggregate, cement and lime feedstock, building stone, soil amendment, and decorative tumbled material; this small specimen has modest collector value.

Geological facts

The rounded shape and smooth finish indicate human tumbling or prolonged abrasion rather than a freshly broken rock. Some similar cream-colored pieces are marble, travertine, or calcite rather than limestone.

Field identification & locations

Common in carbonate terrains worldwide, including parts of the United States, Mexico, Europe, and Asia. Check acid reaction, scratch it with a steel nail, and inspect for fossils or crystalline mosaic texture to distinguish limestone from marble or calcite.