A field classification chart is shown below. In petrology, plutonic igneous rocks are classified by the relative abundance of quartz (Q), plagioclase (P), and alkali feldspar (A) in their composition. pdf document reader such as Adobe Reader. They are designed to print on a standard sheet of 8 ½ x 11 paper. Choose the paper that will contrast with the pencil or pen color that you will be plotting with. We have two types of triangular graph paper, one with black lines and one with blue. Ternary plots are also used in genetics and game theory. The charts produced from this method of graphing are generally referred to as "ternary plots" or "ternary diagrams." They are frequently used to plot the compositions of mixtures in physical chemistry, petrology, mineralogy, metallurgy and other physical sciences. This type of two-dimensional graph can be made when the sum of the three variables always adds up to a constant - usually 100% or 1. Triangular graph paper is used to graph the relationships between three variables on an equilateral triangle.
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