sedimentary
Light-colored sedimentary rock, likely limestone
Calcite-rich limestone (primarily CaCO₃); exact identification requires testing
AI-generated identification · may be incorrectPale cream to tan, dull and fine-grained, with irregular fractured surfaces. Calcite has Mohs hardness 3 and rhombohedral cleavage; limestone’s density and texture vary with impurities and grain size.
Identified More sedimentary →
Explore Light-colored sedimentary rock, likely limestone in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Pale cream to tan, dull and fine-grained, with irregular fractured surfaces. Calcite has Mohs hardness 3 and rhombohedral cleavage; limestone’s density and texture vary with impurities and grain size.
Formation & geological history
Forms through accumulation and lithification of shells, skeletal debris, or carbonate mud, often in warm shallow seas. Its age cannot be determined from the image.
Uses & applications
Limestone is widely used for cement and lime, building stone, aggregate, and soil treatment; this rough fragment appears to have little commercial value.
Geological facts
A drop of dilute hydrochloric acid or vinegar may fizz if the surface contains calcite, though vinegar’s reaction can be weak.
Field identification & locations
Cream color and massive, non-layered appearance are consistent with limestone but not diagnostic; check for acid fizz and a scratch hardness near 3. Common worldwide, especially in former marine basins.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary