sedimentary

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclasts

AI-generated identification · may be incorrect

Hardness: 3 (Mohs scale); Color: Cream, tan, or light grey; Luster: Dull/Earthy; Structure: Clastic or Bioclastic; Cleavage: None (fractures); Specific Gravity: 2.3-2.7

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

Identified June 26, 2026More sedimentary →

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Physical properties

Hardness: 3 (Mohs scale); Color: Cream, tan, or light grey; Luster: Dull/Earthy; Structure: Clastic or Bioclastic; Cleavage: None (fractures); Specific Gravity: 2.3-2.7

Formation & geological history

Formed in shallow, calm, warm marine waters through the accumulation of shell, coral, algal, and fecal debris. Primarily Phanerozoic in age.

Uses & applications

Used as a primary source for lime and cement, in construction aggregate, as a soil conditioner in agriculture, and as a decorative stone.

Geological facts

This rock acts as a time capsule for ancient marine life. Over 10% of all sedimentary rocks are limestones, and they often contain visible fossils of brachiopods, crinoids, or gastropods.

Field identification & locations

Identify by a positive 'fizz' test with cold dilute hydrochloric acid. Look for visible shell fragments or small rounded inclusions (ooids) embedded in a fine-grained matrix.