Rock Identifier
Fossilized Crinoid Stem (Crinoidea fossil (calcite preservation)) — fossil
fossil

Fossilized Crinoid Stem

Crinoidea fossil (calcite preservation)

AI-generated identification · may be incorrect

Hardness 3 on Mohs scale due to calcite composition; exhibits a distinctive geometric grid or circular columnal pattern with radial symmetry; vitreous to dull luster.

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Physical properties

Hardness 3 on Mohs scale due to calcite composition; exhibits a distinctive geometric grid or circular columnal pattern with radial symmetry; vitreous to dull luster.

Formation & geological history

Formed through permineralization, where ancient marine organism remains in shallow Paleozoic seas (over 300 million years ago) were replaced by minerals like calcite.

Uses & applications

Collected by fossil enthusiasts and used in educational displays and amateur geology collections.

Geological facts

Crinoids are commonly known as sea lilies and are closely related to starfish and sea urchins. Their segmented stems often break apart into individual disk-like fossils known colloquially as Indian beads.

Field identification & locations

Easily identified in the field by their characteristic grid-like texture and stacked circular or pentagonal columnal segments, frequently found in limestone and shale deposits worldwide.

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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)) — 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