Psammite
Psammite 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:
| Texture | Common | Greek | Latin |
| Coarse | gravel | psephite ' | rudite ' |
| Medium | sand | psammite ' | arenite ' |
| Fine | clay | pelite ' | lutite ' |
