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

Crinoid Stem Fossil

Crinoidea columnal

AI-generated identification · may be incorrect

Hardness 3-4 on Mohs scale, typically dark grey to black, dull to vitreous luster, composed of calcite with distinctive circular or pentagonal columnals.

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Physical properties

Hardness 3-4 on Mohs scale, typically dark grey to black, dull to vitreous luster, composed of calcite with distinctive circular or pentagonal columnals.

Formation & geological history

Formed through the permineralization of marine invertebrate crinoid stems, commonly dating from the Paleozoic to Mesozoic eras.

Uses & applications

Valued by fossil collectors, educational displays, and sometimes used in lapidary work.

Geological facts

Crinoids are also known as sea lilies and are closely related to starfish and sea urchins.

Field identification & locations

Identify by distinctive disc-like segments with central canals, commonly found in marine sedimentary limestone formations.

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

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Phylum Echinodermata, Class Crinoidea

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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

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Weathered fossil bone fragment (identification uncertain)

Fossilized bone; exact taxon and mineral composition cannot be determined from the image

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