sedimentary
Fossiliferous Limestone (Pink/Red)
Calcium Carbonate (CaCO3) with Bioclasts
Hardness: 3 (Mohs Scale), Color: Pinkish-red matrix with white clasts, Luster: Dull to earthy, Structure: Fine-grained matrix with visible fossil fragments, Cleavage: None (fractures unevenly)
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3 (Mohs Scale), Color: Pinkish-red matrix with white clasts, Luster: Dull to earthy, Structure: Fine-grained matrix with visible fossil fragments, Cleavage: None (fractures unevenly)
Formation & geological history
Formed in marine environments as biological debris (shells, coral, or algae) accumulates and is lithified over millions of years. The pink color is often due to trace iron oxides.
Uses & applications
Commonly used as building stone, decorative tiles, gravel, and in the production of lime or cement. Tumbled pieces are sometimes used for educational purposes.
Geological facts
This specimen contains visible 'bioclasts' or fossil fragments of ancient sea life. Red and pink limestones are famous for being used in Renaissance architecture across Europe.
Field identification & locations
Identify in the field by its reaction to dilute hydrochloric acid (effervescence) and shell-like inclusions. Found in former seabed locations globally, particularly in the Mediterranean and Midwest USA.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary