Rock Identifier
Cockle Shell Fossil (Class Bivalvia) — fossil
fossil

Cockle Shell Fossil

Class Bivalvia

AI-generated identification · may be incorrect

Hardness 3 on Mohs scale, white to off-white color, pearly to dull luster, orthorhombic or trigonal crystal systems for internal aragonite/calcite, specific gravity around 2.7.

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Physical properties

Hardness 3 on Mohs scale, white to off-white color, pearly to dull luster, orthorhombic or trigonal crystal systems for internal aragonite/calcite, specific gravity around 2.7.

Formation & geological history

Formed by the accumulation and mineralization of marine mollusk shells in sedimentary marine environments, often dating from the Cenozoic or Mesozoic eras.

Uses & applications

Used in fossil collecting, educational displays, and coastal decor.

Geological facts

Cockles are bivalve mollusks that burrow in sand, and their ribbed shells frequently form distinct fossil impressions in limestone and sandstone.

Field identification & locations

Identify by radial ribs and heart-shaped profile when viewed end-on; commonly found in sedimentary rock formations near ancient coastlines.

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Fossiliferous limestone (likely a crinoidal or shell-fragment limestone) (Bioclastic limestone, composed chiefly of calcite (CaCO₃)) — sedimentary

Fossiliferous limestone (likely a crinoidal or shell-fragment limestone)

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

sedimentary
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Porous limestone pebble

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Weathered fossil bone fragment (identification uncertain)

Fossilized bone; exact taxon and mineral composition cannot be determined from the image

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