Fossilized Shell in Limestone

Physical Properties

Hardness: 3 (Mohs scale), Color: Cream, off-white with purple/pink tinting, Luster: Dull to earthy, Structure: Amorphous/massive with visible biogenic pores, Cleavage: None (conchoidal fracture)

Formation & Geological History

Formed in shallow marine environments through the accumulation of shell, coral, algal, and fecal debris. This specimen shows a fossilized bivalve or brachiopod fragment embedded in a calcarenite matrix.

Uses & Applications

Used in the manufacture of cement, as a decorative garden stone, and as a educational fossil specimen for hobbyists.

Geological Facts

The small holes visible on the surface are likely 'borings' made by prehistoric sponges or worms (known as ichnofossils) while the shell was on the sea floor millions of years ago.

Field Identification & Locations

Identified by its reaction to dilute hydrochloric acid (it will fizz) and the presence of biological structures. Commonly found in coastal regions and ancient seabed outcrops.

Identified on: 5/13/2026

Mode: Standard