sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
Mohs hardness: 3; Color: tan, grey, pale brown; Luster: earthy to dull; Grain size: fine to microcrystalline; Reacts (fizzes) with diluted acid.
- Hardness
- 3
- Color
- tan, grey, pale brown
- Luster
- earthy to dull
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Physical properties
Mohs hardness: 3; Color: tan, grey, pale brown; Luster: earthy to dull; Grain size: fine to microcrystalline; Reacts (fizzes) with diluted acid.
Formation & geological history
Formed primarily in shallow, warm marine waters from the accumulation of shell, coral, algal, and fecal debris, followed by compaction and cementation.
Uses & applications
Commonly used as construction aggregate, road base, raw material for cement, and in soil conditioning.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks. Famous geological structures like the White Cliffs of Dover are composed mainly of limestone.
Field identification & locations
Identified by its softness (can be scratched by a steel nail) and positive acid test. Extremely widespread globally in sedimentary basins.
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