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Like the QFL diagram, this ternary graph uses the specifications published in 1983 by Dickinson The second set of diagrams shows typical plate tectonic configurations that correspond to the various QFL fields. Qm is monocrystalline quartz, F is feldspar, and Lt is total lithics. This diagram is used like the QFL diagram, but it is designed for provenance studies of sandstones that contain a lot of chert or polycrystalline quartz (quartzite) grains. A triangular diagram that shows the composition of *sandstones and *sands as the proportions of *Quartz, *. > The ternary diagram is divided into 5 fields, here color coded QFL diagram (QFL triangle) Source: A Dictionary of Geology and Earth Sciences Author(s): Michael Allaby. Observe the following: > Quartz is at the top, feldspar on the lower left, and lithics on the lower right.