Medium-grained rocks can be composed of quartz grains, feldspar grains (arkose), or rock fragments and clay (graywacke). Sandstone (Photograph by Parvinder Sethi). Medium-sized grains in clastic sedimentary rocks form sandstone. This sample is a quartz sandstone.
Bliss â¢ McCabe: Discourse Genres 135 special interests and can give lengthy descriptions ofrelevant objects such as rocks or music).â¢ We have identified the following components thatappear to be necessary for a complete proceduraldiscourse regarding how a game is played: goals,players, materials, and procedures.
1. Discourse and the Sociology of Knowledge. 1  At present, various notions of discourse are in circulation in the humanities. They can be grouped into six categories (see KELLER 2004): (1) In Germany, JÃ¼rgen HABERMAS contributed extensively to the dissemination of the term discourse.