sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale, typically yellow, tan, or gray, with an earthy to vitreous luster and effervesces in weak acid.
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Physical properties
Hardness 3 on Mohs scale, typically yellow, tan, or gray, with an earthy to vitreous luster and effervesces in weak acid.
Formation & geological history
Formed from the accumulation of skeletal fragments, coral, algal, and fecal debris in shallow marine environments over millions of years.
Uses & applications
Extensively used in construction as building stone, aggregate for roads, and as a primary raw material for manufacturing cement and lime.
Geological facts
Limestone often preserves abundant marine fossils and can form spectacular karst topography, including caves, sinkholes, and underground rivers.
Field identification & locations
Easily identified in the field by its characteristic reaction to hydrochloric acid, producing carbon dioxide bubbles, and its relatively soft texture.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
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Shale
Shale (clastic sedimentary rock)
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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