sedimentary
Limestone or Tufa
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale, tan to brown color, dull luster, amorphous or fine-grained crystalline structure, effervesces with dilute hydrochloric acid.
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Physical properties
Hardness 3 on Mohs scale, tan to brown color, dull luster, amorphous or fine-grained crystalline structure, effervesces with dilute hydrochloric acid.
Formation & geological history
Formed through the chemical precipitation of calcium carbonate from water in marine environments or freshwater springs.
Uses & applications
Used in construction, aggregate, cement production, and soil conditioning.
Geological facts
Tufa and travertine varieties often preserve impressions of leaves, twigs, and moss due to rapid mineral precipitation.
Field identification & locations
Identify in the field by its characteristic reaction with acid and porous texture; commonly found in regions with extensive limestone bedrock or freshwater spring deposits.
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