Folk classification

These five properties are: grain size, chemically precipitated cements, textural maturity, miscellaneous transported constituents, and clan designation.

To define the clan name one must normalize the sum of abundances of quartz, feldspars and rock fragments to 100%.

After this, the relative percentages of quartz, feldspars and rock fragments are used to plot the appropriate point on a QFR triangle and obtain the clan designation.

If the relative abundances cannot be identified, then the clan name is simply obtained from the QFR triangle.

Miscellaneous transported constituents are any grains that do not fall into the categories described by the QFR diagram.

Textural maturity is a property that relates to the amount of mechanical energy input on transported sediments through the abrasive power of currents and tides.

In Folk's classification scheme, one uses the Wentworth scale to find the appropriate grain size name.

A rock consisting mainly of ooids with some shelly fragments, with a crystalline matrix, would be termed a biooosparite.