fossil

Pink shell fragment

Calcium carbonate, likely aragonite or calcite (CaCO₃); probably a bivalve or gastropod shell fragment

AI-generated identification · may be incorrect

Hardness about 3–4 Mohs; pale pink, smooth, and weakly lustrous with curved growth structure. Shell material is crystalline but commonly retains fibrous or layered microstructure; cleavage is not obvious.

Identified September 4, 2026More fossil →

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Physical properties

Formation & geological history

A biological marine shell formed by mollusks, then weathered or broken after deposition; it may be modern rather than geologically fossilized. True fossilization requires burial and mineral alteration over geological time.

Uses & applications

Used mainly as a decorative or curiosity specimen; shell-derived calcium carbonate is also used in lime, cement, agriculture, and supplements, though this small piece has no industrial value.

Geological facts

The pink coloration commonly comes from organic pigments or trace minerals. The image shows a fragment rather than a complete diagnostic shell, so exact species identification is not possible.

Field identification & locations

Identify by its light weight, curved layered surface, and reaction to dilute acid, which causes fizzing; it is unlike glass or plastic. Common on beaches and in marine sediments worldwide.