sedimentary
Eroded Limestone with Iron Staining
Carbonate Rock (CaCO3)
Hardness: 3-4 (Mohs scale), Color: pinkish-tan to dusty rose, Luster: dull to earthy, Crystal Structure: Microcrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.3-2.7
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Physical properties
Hardness: 3-4 (Mohs scale), Color: pinkish-tan to dusty rose, Luster: dull to earthy, Crystal Structure: Microcrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.3-2.7
Formation & geological history
Formed in shallow marine environments from the accumulation of calcium carbonate (shells, skeletons, or chemical precipitate). The specimen appears water-worn, suggesting it was smoothed by river or coastal erosion. The pink hue is due to trace iron oxide.
Uses & applications
Limestone is used extensively in construction, the manufacture of cement, as a soil conditioner in agriculture, and as a flux in steel making. Small tumbled pieces are often used in landscaping.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks. It is highly susceptible to acid rain, which can dissolve the rock over long periods of time.
Field identification & locations
Identify in the field by its softness (can be scratched by a steel nail) and its reaction to dilute hydrochloric acid (it will fizz). Commonly found in ancient sea beds and riverbanks.
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