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A sedimentary rock, composed mainly of calcite deposits.

Note: In English, limestone used for buildings is identified by the locality from which it originates, e.g. Portland stone, Purbeck stone, Bath stone.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

acceleration due to gravity (m/s2)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM