Rock Identifier
Crinoid Stem Fossil (Crinoid columnal (Echinodermata)) — fossil
fossil

Crinoid Stem Fossil

Crinoid columnal (Echinodermata)

AI-generated identification · may be incorrect

Hardness of 3-4 on the Mohs scale, typically buff, gray, or tan with a distinctive circular, pentagonal, or star-shaped axial canal. Exhibits a stony luster and calcite cleavage.

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Physical properties

Hardness of 3-4 on the Mohs scale, typically buff, gray, or tan with a distinctive circular, pentagonal, or star-shaped axial canal. Exhibits a stony luster and calcite cleavage.

Formation & geological history

Formed from the fossilized calcitic skeletal remains of marine invertebrate crinoids (sea lilies) that accumulated in shallow Paleozoic or Mesozoic seas over 300 million years ago.

Uses & applications

Valued by fossil collectors, used in educational displays, and occasionally polished for unique jewelry pieces.

Geological facts

Crinoid stems are often called 'Indian beads' or 'fairy money' by collectors due to their coin-like or bead-like stacked segments when weathered out of limestone.

Field identification & locations

Easily identified by their cylindrical shape and internal star or dot pattern, commonly found weathered out of ancient limestone beds worldwide.

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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

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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)

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