Limestone

Limestone

Limestone is 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.

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Famous quotes containing the word limestone:

    “Peering, I heard the hooves come down the hill.
    The posse passed, twelve horse; the leader’s face
    Was worn as limestone on an ancient sill.”
    —Allen Tate (1899–1979)