sedimentary
Limestone (with possible Manganese oxide inclusions)
Sedimentary Calcium Carbonate (CaCO3)
Hardness: 3-4 (Mohs scale), Color: Grayish-tan to light brown with black dendritic or patch staining, Luster: Dull/Earthy, Crystal Structure: Trigonal (microcrystalline)
- Luster
- Dull/Earthy, Crystal Structure: Trigonal (microcrystalline)
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Physical properties
Hardness: 3-4 (Mohs scale), Color: Grayish-tan to light brown with black dendritic or patch staining, Luster: Dull/Earthy, Crystal Structure: Trigonal (microcrystalline)
Formation & geological history
Formed primarily from the accumulation of shell, coral, algal, and fecal debris in marine environments. The dark spots likely represent secondary manganese oxide precipitation.
Uses & applications
Used extensively in construction (aggregate, cement making), agriculture (soil conditioner), and industrial chemical processes.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks. It is the primary source of lime used in mortar and plaster.
Field identification & locations
Identified by its reaction (fizzing) when exposed to dilute hydrochloric acid. Commonly found in karst landscapes and ancient sea beds.
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