The Collaborative International Dictionary
Argillaceous schist
Argillaceous \Ar`gil*la"ceous\, a. [L. argillaceus, fr. argilla.] Of the nature of clay; consisting of, or containing, argil or clay; clayey.
Argillaceous sandstone (Geol.), a sandstone containing much clay.
Argillaceous iron ore, the clay ironstone.
Argillaceous schist or state. See Argillite.
Wikipedia
Argillaceous schist
Argillaceous schist is metamorphic rock which exhibits fine laminations of clay materials. Its protolith is argillite.
Category:Schist