sedimentary
Limestone pebble
Sedimentary rock, primarily calcium carbonate (CaCO3)
Hardness of 3 on the Mohs scale, typically brown to gray in color, earthy to dull luster, cryptocrystalline structure, good cleavage in three directions for calcite, specific gravity around 2.7.
Identified More sedimentary →
Explore Limestone pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 3 on the Mohs scale, typically brown to gray in color, earthy to dull luster, cryptocrystalline structure, good cleavage in three directions for calcite, specific gravity around 2.7.
Formation & geological history
Formed through the accumulation and compaction of organic remains such as shells, coral, and algae, or through chemical precipitation in marine environments over millions of years.
Uses & applications
Used in construction, production of lime and cement, road base, and agricultural soil conditioning.
Geological facts
Limestone often contains fossils of ancient marine organisms and reacts vigorously with dilute hydrochloric acid due to its calcium carbonate content.
Field identification & locations
Can be identified in the field by its characteristic hardness, reaction to acid, and typical sedimentary layering or presence of fossils. Commonly found in regions with ancient shallow seas.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary