sedimentary
Limestone Pebble
Calcareous sedimentary rock (CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale, grayish-brown color, dull luster, microcrystalline or granular structure, specific gravity around 2.7.
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Physical properties
Hardness 3 on Mohs scale, grayish-brown color, dull luster, microcrystalline or granular structure, specific gravity around 2.7.
Formation & geological history
Formed from the accumulation of organic carbonate debris and chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Commonly used in construction, cement production, agriculture, and general landscaping.
Geological facts
Limestone frequently contains well-preserved fossils and readily dissolves in slightly acidic water to form karst landscapes and caves.
Field identification & locations
Easily identified by its characteristic gray color and a strong fizz reaction when exposed to dilute hydrochloric acid. Found worldwide in sedimentary basins.
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