Rock Identifier
Crinoid Fossil (Crinoidea (calcite fossil)) — fossil
fossil

Crinoid Fossil

Crinoidea (calcite fossil)

AI-generated identification · may be incorrect

Hardness 3 on Mohs scale due to calcite, typically gray or brownish-gray, dull to vitreous luster, often exhibits distinctive circular or star-shaped segments.

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Physical properties

Hardness 3 on Mohs scale due to calcite, typically gray or brownish-gray, dull to vitreous luster, often exhibits distinctive circular or star-shaped segments.

Formation & geological history

Formed through the fossilization of marine invertebrates (sea lilies) that accumulated in ancient shallow seas primarily during the Paleozoic era.

Uses & applications

Used primarily by fossil collectors, educational displays, and as index fossils for geological dating.

Geological facts

Often called 'saint cutstones' or 'fairy beads' in folklore, crinoids date back over 480 million years and sometimes form entire limestone beds.

Field identification & locations

Identify by looking for cylindrical columnals with a central hole and a segmented, stem-like appearance. Commonly found in limestone and shale formations worldwide.

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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

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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
Weathered fossil bone fragment (identification uncertain) (Fossilized bone; exact taxon and mineral composition cannot be determined from the image) — fossil

Weathered fossil bone fragment (identification uncertain)

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

fossil