Micrite is lime mud, carbonate of mud grade. In the Folk classification micrite is a carbonate rock dominated by fine-grained calcite. Carbonate rocks that contain fine-grained calcite in addition to allochems are named intramicrite, oomicrite, biomicrite or pelmicrite under the Folk classification depending on the dominant allochem.
Micrite as a component of carbonate rocks can occur as a matrix, as micrite envelopes around allochems or as peloids.
Micrite can be generated by chemical precipitation, from disaggregation of peloids, or by micritization.
- Folk, R.L., 1959, Practical petrographic classification of limestones: American Association of Petroleum Geologists Bulletin, v. 43, p. 1-38.
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