sedimentary
Limestone with Calcareous Accretion
Sedimentary Carbonate Rock (CaCO3)
Hardness: 3 (Mohs scale), Color: tan-grey to light brown, Luster: dull to earthy, Crystal structure: rhombohedral (microcrystalline), contains small vugs and clastic textures.
Identified More sedimentary →
Explore Limestone with Calcareous Accretion in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3 (Mohs scale), Color: tan-grey to light brown, Luster: dull to earthy, Crystal structure: rhombohedral (microcrystalline), contains small vugs and clastic textures.
Formation & geological history
Formed in marine environments through the accumulation of shell, coral, algal, and fecal debris over millions of years. The grey cluster suggests a modern calcareous accretion or mud-dauber nest calcified by minerals.
Uses & applications
Primarily used in construction (crushed stone, cement), agriculture (lime), and as building facades.
Geological facts
Limestone occupies about 10% of the total volume of all sedimentary rocks. It often contains fossils of ancient marine life such as crinoids or mollusks.
Field identification & locations
Identify in the field by its reaction to dilute hydrochloric acid (it will fizz) and its relatively soft surface that can be scratched by a steel nail. Found worldwide in ancient seabed regions.
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