fossil

Crinoid Stem Fossil

Crinoidea columnal

Hardness 3-4 on Mohs scale, gray to tan color, vitreous to dull luster, calcite composition, circular or pentagonal symmetry.

Identified October 18, 2026More fossil →

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Physical properties

Hardness 3-4 on Mohs scale, gray to tan color, vitreous to dull luster, calcite composition, circular or pentagonal symmetry.

Formed during the Paleozoic to Mesozoic eras through the permineralization of crinoid columnals in marine sedimentary environments.

Used in educational displays, fossil collecting, and occasionally crafted into jewelry.

Commonly known as Indian bead stones or 'columnals', they often weather out of limestone formations in distinct disk shapes.

Identify by their characteristic wheel-like shape and central canal; found globally in ancient marine limestone deposits.

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

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)

Porous limestone pebble

Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image

Fossil oyster shell

Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)