from Wikipedia, the free encyclopedia

Pelit ( Greek pelos "clay, silt") is the name for fine clastic sedimentary rocks with grain sizes below 0.02 mm ( clay to medium silt ). In principle, the term can be used independently of the material, but in practice it is almost exclusively applied to clastic silicate rocks . It is therefore largely synonymous with the term claystone .

In the case of a metamorphosis , pelites are given the prefix meta -. Examples of such metapelites are phyllite and mica schist .

A distinction is made between the fine- clastic pelites, the medium-clastic ( Psammite ) and the coarse-clastic ( Psephite ). The terms psammite and psephite are usually used almost exclusively for clastic silicate rocks. In carbonate petrography, the terms lutite / siltite / arenite / rudite are used much more frequently to describe or name rocks according to grain sizes. As an alternative to the Pelit / Psammit / Psephit scheme for naming siliciclastic sedimentary rocks according to grain sizes, the terms claystone / siltstone / sandstone / conglomerate or breccia are used.


  • Hans Murawski, Wilhelm Meyer: Geological dictionary . 11th edition. Elsevier / Spektrum, Heidelberg 2004, ISBN 3-8274-1445-8 , pp. 112, 118 and Tab. VI 1–12 .
  • Hans Füchtbauer (1988): 4. Sandstones. In: Hans Füchtbauer [Hrsg.], Sediment-Petrology, Part 2, Sediments and Sedimentary Rocks. 4th edition: 97-183, Stuttgart (Schweizerbart).