sedimentary
Grey Limestone
Calcium Carbonate (CaCO3)
Mohs hardness 3, light to dark grey color, earthy to dull luster, fine-grained to microcrystalline structure, effervesces vigorously in cold dilute hydrochloric acid.
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Physical properties
Mohs hardness 3, light to dark grey color, earthy to dull luster, fine-grained to microcrystalline structure, effervesces vigorously in cold dilute hydrochloric acid.
Formation & geological history
Formed in warm, shallow marine environments through the accumulation and compaction of organic debris such as shells, coral, and algal remains, as well as chemical precipitation of calcium carbonate.
Uses & applications
Widely used in construction as aggregate, dimension stone, cement manufacturing, lime production for agriculture, and soil stabilization.
Geological facts
Limestone covers about 10% of total land area of all continents and often contains abundant marine fossils.
Field identification & locations
Identified in the field by its softness compared to silicate rocks and quick reaction with dilute acid. Commonly found in karst landscapes, quarries, and mountain ranges worldwide.
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