sedimentary
Limestone Pebble
Sedimentary Rock (Calcite, CaCO3)
Hardness: 3 on Mohs scale; Color: Off-white, grey, or beige with weathering marks; Luster: Dull to earthy; Crystal structure: Microcrystalline; Specific Gravity: 2.5 - 2.7
- Hardness
- 3 on Mohs scale
- Color
- Off-white, grey, or beige with weathering marks
- Luster
- Dull to earthy
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: 3 on Mohs scale; Color: Off-white, grey, or beige with weathering marks; Luster: Dull to earthy; Crystal structure: Microcrystalline; Specific Gravity: 2.5 - 2.7
Formation & geological history
Formed from the accumulation and compaction of organic remains such as shells, coral, and algal debris in marine environments, often dating back hundreds of millions of years.
Uses & applications
Used in construction, cement production, agriculture, and as road base. Small pebbles are commonly found in gravel mixes.
Geological facts
Limestone often contains fossils of ancient marine organisms and reacts readily with weak acids like vinegar due to its calcium carbonate content.
Field identification & locations
Commonly found in riverbeds, beaches, and sedimentary basins worldwide. Identify by its relatively soft nature and effervescence when tested with acid.
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
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary