sedimentary

Crinoid Columnal Fossil

Crinoid ossicle (Class Crinoidea)

AI-generated identification · may be incorrect

Hardness: 3 (calcite); Color: Tan, grey, or white; Luster: Dull to vitreous; Structure: Disk-shaped or ring-like with a central hole (lumen); Composition: Calcium carbonate.

Hardness: 3 (calcite)
Color: Tan, grey, or white
Luster: Dull to vitreous

Identified May 29, 2026More sedimentary →

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Physical properties

Hardness: 3 (calcite); Color: Tan, grey, or white; Luster: Dull to vitreous; Structure: Disk-shaped or ring-like with a central hole (lumen); Composition: Calcium carbonate.

Formation & geological history

Formed from the fossilized remains of marine animals related to starfish and sea urchins. These segmented stems lived during the Paleozoic era (approx. 250-500 million years ago) in shallow seas.

Uses & applications

Educational specimens, hobbyist collecting, and sometimes used in folk jewelry (known as 'St. Cuthbert's beads').

Geological facts

Crinoids are often called 'sea lilies' because they resemble plants, but they are actually animals. Their fossilized stem segments are among the most common fossils found in limestone layers worldwide.

Field identification & locations

Identify by the distinct wheel or donut shape with a central hole. Often found in limestone outcrops, creek beds, or gravel deposits where ancient seafloors are exposed.