psephite
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.
Noun
- 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.
Origin
From Ancient Greek ψῆφος (psêphos, “pebble”) + -ite.