sedimentary
Crushed Limestone
Sedimentary Calcite/Dolomite Rock (CaCO3)
Hardness: 3 on the Mohs scale. Color: Dark gray to charcoal with small white calcitic flecks. Luster: Dull to earthy. Texture: Fine-grained, microcrystalline.
- Hardness
- 3 on the Mohs scale
- Color
- Dark gray to charcoal with small white calcitic flecks
- Luster
- Dull to earthy
Identified More sedimentary →
Explore Crushed Limestone in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3 on the Mohs scale. Color: Dark gray to charcoal with small white calcitic flecks. Luster: Dull to earthy. Texture: Fine-grained, microcrystalline.
Formation & geological history
Formed through the accumulation and compaction of organic debris like shells and coral, or chemical precipitation of calcium carbonate in shallow marine environments over millions of years.
Uses & applications
Extensively used as construction aggregate, road base material, ballast for railways, manufacturing of cement, and soil conditioner in agriculture.
Geological facts
Limestone accounts for about 10% of the total volume of all sedimentary rocks on Earth. It reacts strongly (effervesces) with dilute hydrochloric acid.
Field identification & locations
Easily identified by its soft nature (can be scratched by a steel nail or copper penny) and effervescence when tested with acid. Extremely common in gravel mixes and near construction sites.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale
Argillaceous sedimentary rock
sedimentary
Mudstone
Argillite / Siliciclastic sedimentary rock
sedimentary