sedimentary
Crushed Limestone
Limestone (CaCO3)
Hardness: 3-4 (Mohs scale); Color: White, cream, or light grey; Luster: Dull to earthy; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Inconspicuous; Specific gravity: 2.5-2.7
- Hardness
- 3-4 (Mohs scale)
- Color
- White, cream, or light grey
- Luster
- Dull to earthy
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Physical properties
Hardness: 3-4 (Mohs scale); Color: White, cream, or light grey; Luster: Dull to earthy; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Inconspicuous; Specific gravity: 2.5-2.7
Formation & geological history
Formed through the accumulation of shell, coral, algal, and fecal debris in warm, shallow marine waters. Can also form through chemical precipitation from calcium carbonate-rich waters.
Uses & applications
Broadly used in construction as road base, concrete aggregate, and manufacturing of cement. Also used in soil neutralization for agriculture.
Geological facts
Limestone is the primary source of lime for the steel and paper industries. It can often contain visible fossils of marine organisms such as brachiopods or crinoids.
Field identification & locations
Identify by its reaction (fizzing) when exposed to dilute hydrochloric acid. It is very common in ancient seabed regions and karst landscapes.
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