sedimentary
Limestone with Fossil Fragments
Bioclastic Carbonate Rock (CaCO3)
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
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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.
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