sedimentary
Weathered limestone fragment
Calcite-rich limestone, chiefly calcium carbonate (CaCO₃)
AI-generated identification · may be incorrectPale tan-gray, dull to slightly earthy luster, fine-grained and irregularly fractured; calcite hardness is Mohs 3, with weak cleavage and specific gravity about 2.7. The blurry image does not show crystals or fossils clearly.
Identified More sedimentary →
Explore Weathered limestone fragment in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Pale tan-gray, dull to slightly earthy luster, fine-grained and irregularly fractured; calcite hardness is Mohs 3, with weak cleavage and specific gravity about 2.7. The blurry image does not show crystals or fossils clearly.
Formation & geological history
Forms when marine carbonate mud, shells, or chemical precipitates lithify; many limestones range from Paleozoic to Cenozoic in age. Weathering has rounded and stained this fragment.
Uses & applications
Used for aggregate, cement, lime, building stone, and landscaping; attractive fossiliferous or crystalline pieces may be collected, but this specimen appears low-value.
Geological facts
Limestone commonly reacts vigorously with dilute hydrochloric acid or household vinegar, producing bubbles from released carbon dioxide. It can recrystallize into marble during metamorphism.
Field identification & locations
Common worldwide, especially in former shallow marine basins; identify by pale color, relatively soft surface, and acid effervescence. Confirm with a scratch test and acid test on a fresh surface.
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
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary