limestone ( synonym found)
Definition of limestone:

(n) : an abundant rock of marine and fresh-water sediments; primarily composed of calcite (CaCO?); it occurs in a variety of forms, both crystalline and amorphous
Definition of limestone:

(n) : an abundant rock of marine and fresh-water sediments; primarily composed of calcite (CaCO?); it occurs in a variety of forms, both crystalline and amorphous
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