sedimentary

Fossiliferous Limestone

Fossiliferous Limestone (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3 on Mohs scale; Color: Gray to tan; Luster: Dull or earthy; Structure: Clastic or Biogenic; Specific Gravity: 2.5-2.7. It contains visible shell fragments and marine fossils.

Hardness: 3 on Mohs scale
Color: Gray to tan
Luster: Dull or earthy

Identified May 2, 2026More sedimentary →

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Physical properties

Hardness: 3 on Mohs scale; Color: Gray to tan; Luster: Dull or earthy; Structure: Clastic or Biogenic; Specific Gravity: 2.5-2.7. It contains visible shell fragments and marine fossils.

Formation & geological history

Formed in warm, shallow marine environments through the accumulation of calcium carbonate and organic remains (shells and skeletons of marine organisms) over millions of years.

Uses & applications

Used in the production of cement, as a building stone, in road construction, and highly valued by fossil collectors for educational purposes.

Geological facts

This specimen likely contains fragments of brachiopods or crinoids. Limestone makes up about 10% of the total volume of all sedimentary rocks on Earth.

Field identification & locations

Identified by the presence of visible fossils and its reaction to dilute hydrochloric acid (it will fizz). Commonly found in areas that were once prehistoric seafloors.