sedimentary
Weathered limestone
Calcite-rich limestone, chiefly calcium carbonate (CaCO₃)
AI-generated identification · may be incorrectTan to gray, dull, rough and fine-grained; commonly dominated by calcite (Mohs 3), with possible clay or other impurities. The photo does not show diagnostic crystals or fossils clearly enough for a more specific identification.
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Physical properties
Tan to gray, dull, rough and fine-grained; commonly dominated by calcite (Mohs 3), with possible clay or other impurities. The photo does not show diagnostic crystals or fossils clearly enough for a more specific identification.
Formation & geological history
Forms when carbonate mud, shells, or other calcium-carbonate material accumulates and lithifies in marine or lake settings. Its age cannot be determined from the image.
Uses & applications
Used for cement and lime, aggregate, building stone, and agricultural soil treatment; this rough, weathered material has little jewelry value.
Geological facts
Calcite-rich limestone fizzes when a drop of dilute acid is applied, though weathering or coatings can make the reaction subtle.
Field identification & locations
The pale, blocky, sedimentary-looking fragments are consistent with limestone, but visual identification is uncertain; confirm with an acid test or expert examination. Limestone occurs widely in sedimentary basins worldwide.
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