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

Oyster Fossil

Crassostrea virginica (Fossilized)

AI-generated identification · may be incorrect

Hardness of 3-4 on the Mohs scale, grayish-white to dark gray exterior, dull to pearly luster, composed primarily of calcium carbonate in calcite and aragonite structures.

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Physical properties

Hardness of 3-4 on the Mohs scale, grayish-white to dark gray exterior, dull to pearly luster, composed primarily of calcium carbonate in calcite and aragonite structures.

Formation & geological history

Formed through the fossilization of marine bivalve mollusks in shallow coastal marine environments, often dating from the Cenozoic era or older.

Uses & applications

Used in paleontological research, educational displays, and as a popular specimen for fossil collectors.

Geological facts

Fossilized oyster shells often preserve intricate growth rings that provide valuable paleoclimatic data about ancient marine temperatures.

Field identification & locations

Identified by its elongated, irregular shell shape and prominent lamellar growth layers; commonly found in sedimentary limestone and clay deposits worldwide.

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Probable fossil-bearing rock or mineral concretion (Unidentified carbonate-rich concretion with a possible fossil inclusion) — fossil

Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

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Likely fossil oyster shell (Fossilized bivalve shell; exact species cannot be identified from the image) — fossil

Likely fossil oyster shell

Fossilized bivalve shell; exact species cannot be identified from the image

fossil
Crinoid Stem Fossil in Matrix (Phylum Echinodermata, Class Crinoidea) — fossil

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

fossil
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
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

sedimentary
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