sedimentary
Limestone (Weathered/Silicified)
Sedimentary carbonate rock (primarily CaCO3)
Hardness varies from 3 (pure calcite) to 7 if heavily silicified; color is typically yellowish-brown due to iron oxide staining; dull to earthy luster; cryptocrystalline or microcrystalline structure; effervesces with dilute hydrochloric acid if not overly weathered.
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Physical properties
Hardness varies from 3 (pure calcite) to 7 if heavily silicified; color is typically yellowish-brown due to iron oxide staining; dull to earthy luster; cryptocrystalline or microcrystalline structure; effervesces with dilute hydrochloric acid if not overly weathered.
Formation & geological history
Formed through the accumulation and compaction of organic remains such as shells, coral, and algal debris in marine environments, subsequently weathered and leached over millions of years.
Uses & applications
Used in construction, cement production, road aggregate, agriculture, and educational study.
Geological facts
Yellowish-brown weathered surfaces are typically caused by limonite or goethite staining from iron-rich groundwater percolating through the porous rock structure.
Field identification & locations
Commonly found in sedimentary basins and weathered outcroppings worldwide; easily identified by its characteristic pitted, irregular weathering patterns and yellowish-brown patina.
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