Definition of material - limestone

What is limestone? (stone)

a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3); many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera

• Imperial Castle in Poznań
  in Poznań
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  in Poznań
• Giza Necropolis
  in Giza
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  in Moscow
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