sedimentary
Limestone pebble
Sedimentary rock, primarily calcium carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, typically brown to gray in color, earthy to dull luster, cryptocrystalline structure, good cleavage in three directions for calcite, specific gravity around 2.7.
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Physical properties
Hardness of 3 on the Mohs scale, typically brown to gray in color, earthy to dull luster, cryptocrystalline structure, good cleavage in three directions for calcite, specific gravity around 2.7.
Formation & geological history
Formed through the accumulation and compaction of organic remains such as shells, coral, and algae, or through chemical precipitation in marine environments over millions of years.
Uses & applications
Used in construction, production of lime and cement, road base, and agricultural soil conditioning.
Geological facts
Limestone often contains fossils of ancient marine organisms and reacts vigorously with dilute hydrochloric acid due to its calcium carbonate content.
Field identification & locations
Can be identified in the field by its characteristic hardness, reaction to acid, and typical sedimentary layering or presence of fossils. Commonly found in regions with ancient shallow seas.
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