psammite

thumb | right Psammite (Greek: psammitēs "(made) from sand", from psammos "sand") is a general term for sandstone. It is equivalent to the Latin-derived term arenite and is commonly used in various publications to describe a metamorphosed sedimentary rock with a dominantly sandstone protolith. In Europe, this term was formerly used for a fine-grained, fissile, clayey sandstone. Pettijohn gives the following descriptive terms based on grain size, avoiding the use of terms such as "clay" or "argillaceous", which carry an implication of chemical composition:

{| class="wikitable" |+Descriptive size terms |- ! Texture !! Common !! Greek !! Latin |- ! Coarse | gravel(ly) || psephite (psephitic)|| rudite (rudaceous) |- ! Medium | sand(y) || psammite (psammitic)|| arenite (arenaceous) |- ! Fine | clay(ey) || pelite (pelitic)|| lutite (lutaceous) |}