sedimentary
Limestone Nodule
Sedimentary carbonate rock (CaCO3)
AI-generated identification · may be incorrectHardness 3 on the Mohs scale, typically brown or gray in color, dull to earthy luster, and reacts with dilute hydrochloric acid.
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Physical properties
Hardness 3 on the Mohs scale, typically brown or gray in color, dull to earthy luster, and reacts with dilute hydrochloric acid.
Formation & geological history
Formed through the accumulation and compaction of marine skeletal fragments and chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Used primarily in construction, cement production, agriculture, and as a raw material for various chemical industries.
Geological facts
Limestone often preserves a rich record of ancient marine fossils and covers significant portions of the Earth's continental crust.
Field identification & locations
Identified by its moderate hardness, earthy texture, and characteristic fizz when tested with acid. Commonly found in sedimentary basins worldwide.
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