sedimentary
Limestone Pebble
Sedimentary carbonate rock (CaCO3)
Mohs hardness of 3, colors range from gray, white, to tan, dull to earthy luster, fine-grained crystal structure, good cleavage in some forms, specific gravity around 2.7.
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Physical properties
Mohs hardness of 3, colors range from gray, white, to tan, dull to earthy luster, fine-grained crystal structure, good cleavage in some forms, specific gravity around 2.7.
Formation & geological history
Formed from the accumulation of skeletal fragments of marine organisms like coral, algal, and mollusks over millions of years in shallow marine environments.
Uses & applications
Used widely in construction, production of cement, road base, and as a soil conditioner in agriculture.
Geological facts
Limestone often contains well-preserved fossils of ancient marine life due to its organic accumulation process in marine environments.
Field identification & locations
Can be easily identified in the field by its characteristic fizz when a drop of weak hydrochloric acid is applied due to the release of carbon dioxide.
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