Rock Identifier
Crinoid Stem Fossil / Fossiliferous Limestone (Calcium carbonate, primarily calcite (CaCO3)) — fossil
fossil

Crinoid Stem Fossil / Fossiliferous Limestone

Calcium carbonate, primarily calcite (CaCO3)

AI-generated identification · may be incorrect

Hardness of 3 on the Mohs scale, varies in color from grey to white and dark blue, vitreous to earthy luster, hexagonal crystal system in individual calcite grains.

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Physical properties

Hardness of 3 on the Mohs scale, varies in color from grey to white and dark blue, vitreous to earthy luster, hexagonal crystal system in individual calcite grains.

Formation & geological history

Formed in ancient shallow marine environments during the Paleozoic era as skeletal fragments accumulated on the seafloor.

Uses & applications

Used primarily in lapidary work, ornamental stone carving, and as a popular specimen for fossil collectors.

Geological facts

Crinoids are marine animals commonly known as sea lilies, and their disk-like stem segments are often called Indian beads.

Field identification & locations

Identified by the distinct circular or star-shaped columnal patterns visible within the limestone matrix; commonly found in sedimentary rock formations worldwide.

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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

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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