sedimentary
Limestone pebble
Calcium carbonate (CaCO3)
AI-generated identification · may be incorrectMohs hardness of 3, light gray to tan color, dull to earthy luster, and reacts strongly with dilute hydrochloric acid.
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
Mohs hardness of 3, light gray to tan color, dull to earthy luster, and reacts strongly with dilute hydrochloric acid.
Formation & geological history
Formed through the accumulation of marine organism skeletal fragments and chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Used in construction, cement production, agriculture for soil neutralization, and aggregate material.
Geological facts
Limestone often preserves abundant fossils and forms famous geological landmarks like caves and karst topography.
Field identification & locations
Easily identified by its moderate hardness, reactive fizz with acid, and common occurrence in sedimentary rock layers worldwide.
More like this
Other sedimentary specimens
Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary