Rock Identifier
Fossiliferous Limestone with Crinoid Stem (Sedimentary Rock with Echinodermata fossil fragment) — fossil
fossil

Fossiliferous Limestone with Crinoid Stem

Sedimentary Rock with Echinodermata fossil fragment

AI-generated identification · may be incorrect

Hardness varies from 3 (for the calcite limestone matrix) to 4 on the Mohs scale. Color is light tan to grey with dark speckles and fossils. Luster is earthy to vitreous. Cryptocrystalline structure with distinct fossil inclusions.

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Physical properties

Hardness varies from 3 (for the calcite limestone matrix) to 4 on the Mohs scale. Color is light tan to grey with dark speckles and fossils. Luster is earthy to vitreous. Cryptocrystalline structure with distinct fossil inclusions.

Formation & geological history

Formed in ancient shallow marine environments where calcium carbonate accumulated from shells and skeletal fragments of marine organisms, dating primarily from the Paleozoic era.

Uses & applications

Used in educational settings, fossil collecting, and as a natural decorative specimen.

Geological facts

The small protruding button-like structure on the specimen is a crinoid columnal, often colloquially called 'Indian beads' or 'stone lily' stems.

Field identification & locations

Found in sedimentary strata worldwide, particularly in areas with ancient limestone beds. Easily identifiable by the circular or star-shaped hollow columnals embedded in the rock.

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