Sediment particles with a grain size between
\(\pu{0.004 mm}\) and
\(\pu{0.062 mm}\), i.e., coarser than clay particles but finer than sand.
Source: PAC, 2009,
81, 829. (
Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 945 [
Terms] [
Paper]