Psephite (Greek: psephos, "pebble")[1] is either a sediment or sedimentary rock composed of fragments that are coarser than sand and which are enclosed in a matrix that varies in kind and amount.
Shingle, gravel, breccia, and especially conglomerate, would all be considered psephites.
Psephite is more commonly used for a metamorphosed rudite.
[2] Pettijohn [3] 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:
This sedimentary rock-related article is a stub.