sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
Hardness: 3-4 (Mohs scale); Color: light grey; Luster: matte/earthy; Crystal structure: microcrystalline; Specific gravity: approx. 2.7
- Hardness
- 3-4 (Mohs scale)
- Color
- light grey
- Luster
- matte/earthy
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Physical properties
Hardness: 3-4 (Mohs scale); Color: light grey; Luster: matte/earthy; Crystal structure: microcrystalline; Specific gravity: approx. 2.7
Formation & geological history
Formed in marine environments through the accumulation of shell, coral, and algal debris or chemical precipitation. This pebble has been smoothed by water erosion.
Uses & applications
Limestone is extensively used in the construction of roads, as an ingredient in cement, as a decorative stone, and in agricultural soil neutralizers.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks. It often contains fossils of microscopic marine organisms.
Field identification & locations
Identified by its grey color and relatively soft surface (scrachable by steel). It reacts with dilute hydrochloric acid by fizzing. Commonly found along beaches and riverbeds.
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