Rock Identifier
Fossilized Oyster Shell (Crassostrea virginica (Fossilized)) — fossil
fossil

Fossilized Oyster Shell

Crassostrea virginica (Fossilized)

AI-generated identification · may be incorrect

Hardness 3 to 4 on Mohs scale, predominantly white and grey coloration, dull to pearly luster, composed mostly of calcium carbonate in calcite and aragonite structures.

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Physical properties

Hardness 3 to 4 on Mohs scale, predominantly white and grey coloration, dull to pearly luster, composed mostly of calcium carbonate in calcite and aragonite structures.

Formation & geological history

Formed from marine bivalve remains accumulated in shallow coastal environments over millions of years, often dating from the Cenozoic or Mesozoic eras.

Uses & applications

Valued by fossil collectors, educational displays, and sometimes used in coastal decorative crafts.

Geological facts

Fossil oyster shells provide key paleoclimatic data regarding ancient ocean temperatures and salinity levels. They are commonly preserved intact due to their robust calcitic shells.

Field identification & locations

Found worldwide in sedimentary rock formations containing ancient marine deposits; identified by their irregular, layered shell morphology and distinct muscle scars.

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Crinoid Stem Fossil in Matrix

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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)

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Porous limestone pebble (Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image) — sedimentary

Porous limestone pebble

Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image

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Fossil oyster shell (Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)) — fossil

Fossil oyster shell

Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)

fossil