sedimentary

Likely limestone or weathered shell-rich limestone

Calcite-rich carbonate rock, chiefly calcium carbonate (CaCO₃); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Pale cream to gray, rough and weathered, with possible shell-like texture. If limestone, hardness is about 3 Mohs, luster dull to earthy, and calcite crystals are trigonal; a dilute acid typically fizzes.

Identified October 15, 2026More sedimentary →

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At a glance

Common name: Likely limestone or weathered shell-rich limestone
Scientific name: Calcite-rich carbonate rock, chiefly calcium carbonate (CaCO₃); exact identification is uncertain from the image
Category: sedimentary
Identified: October 15, 2026
Method: Standard

AI Estimated Value

About $0-$5 for an ordinary loose fragment; fossil content or unusual provenance could increase value.

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 mud or shell fragments, later compacted and cemented. Its age and precise depositional setting cannot be determined from the photograph.

Uses & applications

Limestone is used for cement, lime, aggregate, and building stone; this small irregular piece appears mainly suitable for collecting or display.

Geological facts

Many limestones preserve fossils or shell fragments, but no definite fossil can be identified here.

Field identification & locations

Look for calcite fizz with dilute acid and visible grains or fossil fragments; common in sedimentary formations worldwide. The image alone does not establish its identity.