sedimentary
Limestone Cobble
Sedimentary Calcium Carbonate (CaCO3)
Hardness: 3 (Mohs scale); Color: Cream, light gray, beige with iron staining; Luster: Dull or earthy; Structure: Clastic or bio-chemical, often rounded by water erosion; Cleavage: None (conchoidal to irregular fracture)
- Hardness
- 3 (Mohs scale)
- Color
- Cream, light gray, beige with iron staining
- Luster
- Dull or earthy
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Physical properties
Hardness: 3 (Mohs scale); Color: Cream, light gray, beige with iron staining; Luster: Dull or earthy; Structure: Clastic or bio-chemical, often rounded by water erosion; Cleavage: None (conchoidal to irregular fracture)
Formation & geological history
Formed from the accumulation of shell, coral, algal, and fecal debris in warm, shallow marine waters. This specific specimen has been rounded into a 'cobble' or 'river rock' shape through fluvial or glacial transport.
Uses & applications
Commonly used in landscaping, construction aggregates, cement manufacturing, and agricultural lime.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks. It often contains marine fossils and is the primary material in major cave systems.
Field identification & locations
Identify by its characteristic light color and reaction (fizzing) when a small drop of dilute hydrochloric acid or vinegar is applied. Look for it in riverbeds or decorative landscaping rock piles.
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