Rock Identifier

fossil

Crinoid Fossil

Crinoidea

AI-generated identification · may be incorrect

Hardness 3-4 (calcite); colors typically grey, brown, or beige; vitreous to dull luster; exhibits distinct circular or pentagonal stem fossil segments.

Identified November 13, 2026More fossil →

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Physical properties

Hardness 3-4 (calcite); colors typically grey, brown, or beige; vitreous to dull luster; exhibits distinct circular or pentagonal stem fossil segments.

Formation & geological history

Formed through the fossilization of marine invertebrate echinoderms primarily during the Paleozoic and Mesozoic eras within sedimentary environments.

Uses & applications

Valued as educational specimens, fossils for geological collections, and occasionally polished for decorative jewelry.

Geological facts

Often referred to as 'stone lilies' due to their plant-like appearance, crinoids are actually ancient marine animals related to starfish.

Field identification & locations

Identify by characteristic columnal discs with central holes ('indian beads') found embedded in limestone or shale formations worldwide.

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Other fossil specimens

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

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 (Invertebrate fossil / Trace fossil) — fossil

Fossil

Invertebrate fossil / Trace fossil

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

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

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)

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