sedimentary
Limestone with Fossil Fragment
Bioclastic limestone (Calcium carbonate, CaCO3)
Hardness of 3 on the Mohs scale, gray to brownish color, dull to earthy luster, cryptocrystalline structure, poor cleavage.
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Physical properties
Hardness of 3 on the Mohs scale, gray to brownish color, dull to earthy luster, cryptocrystalline structure, poor cleavage.
Formation & geological history
Formed in marine environments through the accumulation of shell, coral, algal, and fecal debris, typically ranging from Paleozoic to Cenozoic eras.
Uses & applications
Used in construction, cement production, agriculture as soil conditioner, and as a common educational rock specimen.
Geological facts
Limestone often preserves ancient marine life, acting as a window into prehistoric ocean ecosystems millions of years ago.
Field identification & locations
Can be identified in the field by its characteristic gray or tan appearance, relative softness, and vigorous fizzing reaction when exposed to dilute hydrochloric acid (HCl).
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