Rock Identifier
Belemnite Fossil (Belemnitida (rostrum)) — fossil
fossil

Belemnite Fossil

Belemnitida (rostrum)

AI-generated identification · may be incorrect

Hardness of 3-4 on the Mohs scale, typically brown to beige in color, vitreous to dull luster, solid calcite crystal structure with a bullet-shaped or cigar-like bullet form.

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Physical properties

Hardness of 3-4 on the Mohs scale, typically brown to beige in color, vitreous to dull luster, solid calcite crystal structure with a bullet-shaped or cigar-like bullet form.

Formation & geological history

Formed during the Mesozoic era (Jurassic to Cretaceous) through the fossilization of the internal calcite guard (rostrum) of an extinct squid-like cephalopod.

Uses & applications

Used primarily by fossil collectors, for educational displays, and as index fossils for dating marine sedimentary strata.

Geological facts

Commonly known in folklore as thunderbolts or devil's fingers, ancient people believed they fell from the sky during thunderstorms.

Field identification & locations

Found worldwide in marine sedimentary rocks like chalk and limestone; identified by their distinct bullet shape, fibrous radial internal structure, and pointy tip.

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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

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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)

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