sedimentary

Limestone with Fossil Fragments

Bioclastic Carbonate Rock (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3 (Mohs scale); Color: Gray to light tan; Luster: Dull/Earthy; Structure: Fine-grained matrix with visible fossil bioclasts; Specific Gravity: 2.5-2.7

Hardness: 3 (Mohs scale)
Color: Gray to light tan
Luster: Dull/Earthy

Identified July 7, 2026More sedimentary →

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Physical properties

Hardness: 3 (Mohs scale); Color: Gray to light tan; Luster: Dull/Earthy; Structure: Fine-grained matrix with visible fossil bioclasts; Specific Gravity: 2.5-2.7

Formation & geological history

Formed in shallow marine environments from the accumulation of calcium carbonate and organic debris such as shell and coral fragments over millions of years.

Uses & applications

Used primarily in construction as road base, concrete aggregate, and in the production of cement and lime; also used as a soil conditioner in agriculture.

Geological facts

Limestone makes up about 10% of the total volume of all sedimentary rocks. This specimen contains visible bioclasts, which are skeletal remains of ancient marine organisms.

Field identification & locations

Identify in the field by applying a drop of cold dilute hydrochloric acid; it will effervesce (fizz) vigorously. It is commonly found in areas that were once prehistoric seafloors.