sedimentary

Fossiliferous limestone pebble

Calcite-rich bioclastic limestone (primarily CaCO₃)

AI-generated identification · may be incorrect

Rounded, polished-looking tan-gray pebble with visible shell or fossil fragments in a fine carbonate matrix. Calcite is Mohs 3, typically vitreous to dull, with trigonal crystals and perfect rhombohedral cleavage; the rock may fizz with dilute acid.

Identified October 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as carbonate mud and marine skeletal debris accumulated and lithified in a shallow sea; the pebble’s precise age cannot be determined from the image and depends on its source formation.

Uses & applications

Commonly used as decorative stone, landscaping gravel, and a collecting specimen; limestone is also widely used for cement and building stone.

Geological facts

The pale flecks appear consistent with fossil fragments, though the image alone cannot confirm their identity. Limestone can preserve abundant evidence of ancient marine ecosystems.

Field identification & locations

Look for carbonate grains or fossils and test an inconspicuous spot with dilute acid for fizzing. Fossiliferous limestone occurs worldwide, especially in ancient marine sedimentary basins.