Everything about Mudstone totally explained
Mudstone (also called
mudrock) is a fine grained
sedimentary rock whose original constituents were
clays or
muds.
Grain size is up to 0.0625
mm (0.0025 in) with individual grains too small to be distinguished without a microscope. With increased pressure over time the platey
clay minerals may become aligned, with the appearance of
fissility or parallel layering. This finely bedded material that splits readily into thin layers is called
shale, as distinct from
mudstone. The lack of fissility or layering in mudstone may be due either to original texture or to the disruption of layering by burrowing organisms in the sediment prior to lithification. Mud rocks, such as mudstone and shale comprise some 65% of all sedimentary rocks. Mudstone looks like hardened
clay and, depending upon circumstances under which it was formed, it may show cracks or fissures, like a sun-baked clay deposit.
They can be separated into 5 categories:
- Siltstone - greater than half of the composition is silt-sized particles.
- Claystone - greater than half of the composition is clay-sized particles.
- Mudstone - indurated mud; a mix of silt and clay sized particles.
- Shale - exhibits lamination or fissility.
- Argillite - has undergone low grade metamorphism.
Further Information
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