sedimentary
Limestone with Calcite Veining
Sedimentary Carbonate Rock (CaCO3)
Hardness: 3 (Mohs scale), Color: Dark grey to bluish-grey with white veins, Luster: Dull/Earthy (matrix) to Vitreous (veins), Cleavage: Perfect rhombohedral in calcite veins, Specific Gravity: 2.71
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Physical properties
Hardness: 3 (Mohs scale), Color: Dark grey to bluish-grey with white veins, Luster: Dull/Earthy (matrix) to Vitreous (veins), Cleavage: Perfect rhombohedral in calcite veins, Specific Gravity: 2.71
Formation & geological history
Formed through the accumulation of marine organic debris or chemical precipitation of calcium carbonate in shallow marine environments. The white veins are secondary calcite deposits that filled fractures within the rock during tectonic stress or hydrothermal activity.
Uses & applications
Used primarily in the construction industry as aggregate, for making cement, and as a building stone. It is also used as a soil conditioner in agriculture and for flue-gas desulfurization.
Geological facts
Limestone often contains fossils of marine organisms. When exposed to acid (like vinegar), it will effervesce (fizz), which is a key diagnostic test for carbonate minerals.
Field identification & locations
Identify in the field by its softness (can be scratched by a steel blade), presence of calcite veins, and positive reaction to dilute hydrochloric acid. Found globally in areas that were once prehistoric sea beds.
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