sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
Hardness: 3-4 (Mohs), Color: Light gray to white, Luster: Dull/Earthy, Structure: Fine-grained clastic or crystalline, Cleavage: None/Irregular
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Physical properties
Hardness: 3-4 (Mohs), Color: Light gray to white, Luster: Dull/Earthy, Structure: Fine-grained clastic or crystalline, Cleavage: None/Irregular
Formation & geological history
Formed primarily from the accumulation of shell, coral, algal, and fecal debris in warm, shallow marine waters. Can also form through chemical precipitation from lake or ocean water.
Uses & applications
Large scale use in construction as aggregate, cement production, and as a soil conditioner in agriculture. Small pebbles are common in landscaping.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks on Earth. It often contains fossils of microscopic marine organisms.
Field identification & locations
Identified by its reaction to dilute hydrochloric acid (effervescence) and its relative softness compared to quartz. Common in former marine basins and riverbeds.
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