[1] Lithic fragments can be derived from sedimentary, igneous or metamorphic rocks.
A lithic fragment is defined using the Gazzi-Dickinson point-counting method and being in the sand-size fraction.
These can include granular (~rhyolitic), microlitic (~andesitic), lathwork (~basaltic), and vitric (glassy).
These correlations between composition and volcanic lithic fragment type are approximate, at best.
These can include shale siltstone fragments, and (at times) chert.