Limestone



[lahym-stohn] /ˈlaɪmˌstoʊn/

noun
1.
a sedimentary rock consisting predominantly of calcium carbonate, varieties of which are formed from the skeletons of marine microorganisms and coral: used as a building and in the manufacture of .
/ˈlaɪmˌstəʊn/
noun
1.
a sedimentary rock consisting mainly of calcium carbonate, deposited as the calcareous remains of marine animals or chemically precipitated from the sea: used as a building stone and in the manufacture of cement, lime, etc
n.

late 14c., from lime (n.1) + stone (n.).
limestone
(līm’stōn’)
A sedimentary rock consisting primarily of calcium carbonate, often in the form of the minerals calcite or aragonite, and sometimes with magnesium carbonate in the form of dolomite. Minor amounts of silica, feldspar, pyrite, and clay may also be present. Limestone can occur in many colors but is usually white, gray, or black. It forms either through the accumulation and compaction of fossil shells or other calcium-carbonate based marine organisms, such as coral, or through the chemical precipitation of calcium carbonate out of sea water.

Sedimentary rock formed primarily of calcium carbonate, often the skeletons of small marine organisms.

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