Psammite (Greek: psammos, "sand") is a general term for sandstone. It is equivalent to the Latin-derived term arenite[1][2] and is commonly used in various publications to describe a metamorphosed sedimentary rock with a dominantly sandstone protolith.[3] In Europe, this term was formerly used for a fine-grained, fissile, clayey sandstone.[2] Pettijohn [4] 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: