sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
Hardness: 3 (Mohs scale), Color: light grey to white, Luster: dull to earthy, Crystal structure: trigonal (microcrystalline), Cleavage: rhombohedral
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Physical properties
Hardness: 3 (Mohs scale), Color: light grey to white, Luster: dull to earthy, Crystal structure: trigonal (microcrystalline), Cleavage: rhombohedral
Formation & geological history
Formed through the accumulation of shell, coral, algal, and fecal debris in clear, warm, shallow marine waters. Often ancient seabed deposits from the Paleozoic or Mesozoic eras.
Uses & applications
Used extensively in construction (road base, concrete aggregate), agriculture (soil conditioner), and chemical industries for lime production.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks. It often contains microscopic fossils of ancient marine organisms.
Field identification & locations
Identify by its light color and reaction (fizzing) to a 10% solution of hydrochloric acid. Common in quarries and gravel driveways worldwide.
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