sedimentary
Limestone Nodule
Sedimentary carbonate rock (CaCO3)
AI-generated identification · may be incorrectHardness 3 on the Mohs scale, grayish-brown color, dull to earthy luster, and fine-grained microcrystalline structure.
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Physical properties
Hardness 3 on the Mohs scale, grayish-brown color, dull to earthy luster, and fine-grained microcrystalline structure.
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, production of lime and cement, and agricultural soil conditioning.
Geological facts
Limestone frequently contains well-preserved fossils and reacts vigorously with dilute hydrochloric acid.
Field identification & locations
Identified easily by its fizzing reaction with acid and relatively soft texture; commonly found in sedimentary basins worldwide.
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