sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
AI-generated identification · may be incorrectMohs hardness of 3, gray to tan color, dull luster, microcrystalline to fragmental structure with visible fossil impressions and a strong reaction to dilute hydrochloric acid.
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Physical properties
Mohs hardness of 3, gray to tan color, dull luster, microcrystalline to fragmental structure with visible fossil impressions and a strong reaction to dilute hydrochloric acid.
Formation & geological history
Formed through the accumulation and compaction of skeletal fragments of marine organisms in shallow, warm marine environments over millions of years.
Uses & applications
Used in construction, cement production, crushed stone, and as educational fossil specimens for collectors.
Geological facts
Limestone often preserves ancient marine ecosystems and can contain crinoids, brachiopods, and bryozoans as seen in this matrix.
Field identification & locations
Identify by its gray, rough texture packed with fossil hash and its effervescence when exposed to acid; commonly found in sedimentary rock formations worldwide.
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