
Micrite is a limestone constituent formed of calcareous particles ranging in diameter up to 4 μm formed by the recrystallization of lime mud. Micrite is a term used to describe lime mud, carbonate of mud grade. The term is also used in the Folk classification to describe a carbonate rock dominated by fine-grained calcite. Carbonate rocks that con...
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http://en.wikipedia.org/wiki/Micrite

sedimentary rock formed of calcareous particles ranging in diameter from 0.06 to 2 mm (0.002 to 0.08 inch) that have been deposited mechanically ... [2 related articles]
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http://www.britannica.com/eb/a-z/m/85

Micro-crystalline carbonate mud.
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http://www.encyclo.co.uk/local/20206
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