A rock fragment, in sedimentary geology, is a sand-sized particle or sand grain that is made up of from valconomultiple grains that are connected on the grain scale. These can include grains which are sand-sized themselves (a granitic rock fragment), or finer-grained materials (shale fragments). This definition is used for QFR ternary diagrams, provenance analysis, and in the Folk classification scheme, mainly in sandstones. Grains that have come together
- "sedimentary rock - Classification of sandstones". Encyclopedia Britannica. Retrieved 2017-08-12.
- Folk, R.L., 1974, Petrology of Sedimentary Rocks: Austin, TX, Hemphill Press, second edition, 182 p.