sedimentary

Fossiliferous Limestone

Calcareous biomicrite / Calcium Carbonate (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3 (Mohs scale); Color: Cream, tan, or grey; Luster: Dull/earthy; Texture: Fine-grained with visible biological structures (fossil imprints); Cleavage: None (conchoidal fracture common)

Hardness: 3 (Mohs scale)
Color: Cream, tan, or grey
Luster: Dull/earthy

Identified April 10, 2026More sedimentary →

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Physical properties

Hardness: 3 (Mohs scale); Color: Cream, tan, or grey; Luster: Dull/earthy; Texture: Fine-grained with visible biological structures (fossil imprints); Cleavage: None (conchoidal fracture common)

Formation & geological history

Formed in warm, shallow marine environments through the accumulation of organic debris such as shell fragments, algae, and coral. This specific specimen likely dates to the Paleozoic or Mesozoic era.

Uses & applications

Used primarily in the construction industry as crushed stone, aggregate, or for making cement. Small fossilized specimens are popular for educational purposes and fossil collecting.

Geological facts

This specimen contains fragments of ancient marine life, likely bryozoans or crinoids. Limestone is the primary source of lime for soil treatment in agriculture and is the main component of most of the world's cave systems.

Field identification & locations

Identify in the field by looking for visible biological textures or patterns. It will react and fizz (effervesce) when in contact with dilute hydrochloric acid. Commonly found in areas that were once prehistoric seabeds.