According to Wentworth's classification (1922) fine mud has grain sizes from 0.0078 mm to 0.0156mm.

Source:

Wentworth C. (1922). "Grain Size Classification." The Journal of Geology: "A Scale of Grade and Class Terms for Clastic Sediments". Retrieved from https://www.planetary.org/space-images/wentworth-1922-grain-size


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