Rock Identifier
Crinoid Stem Fossil (Crinoidea (calcium carbonate)) — fossil
fossil

Crinoid Stem Fossil

Crinoidea (calcium carbonate)

AI-generated identification · may be incorrect

Hardness of 3 on Mohs scale, typically gray, brown, or beige with a dull to vitreous luster. Features a distinct circular or pentagonal columnal shape with a central canal hole.

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Physical properties

Hardness of 3 on Mohs scale, typically gray, brown, or beige with a dull to vitreous luster. Features a distinct circular or pentagonal columnal shape with a central canal hole.

Formation & geological history

Formed through the permineralization of marine invertebrate skeletal remains in shallow Paleozoic to Mesozoic marine environments, dating from roughly 480 to 250 million years ago.

Uses & applications

Valued primarily by fossil collectors, educational institutions, and sometimes polished for jewelry or decorative stone.

Geological facts

Commonly known as 'Indian beads' or 'fairy money' in folklore, crinoids are marine animals related to starfish and sea urchins. Their segmented stems often break apart into individual disk-like fossils.

Field identification & locations

Easily identified by their cylindrical shape, stacked disk-like segments, and central axial canal. Frequently found weathered out of limestone or shale rock formations 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

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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