sedimentary
Fossiliferous Limestone (Pink/Red)
Calcium Carbonate (CaCO3) with Bioclasts
AI-generated identification · may be incorrectHardness: 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)
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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.
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