Abstract
Identification of minerals in thin section under the petrographic microscope is greatly facilitated by the use of one graph on which the birefringences and optic angles of common minerals are plotted. Uniaxial optics are treated as limiting cases of biaxial optics; isotropic optics are considered to have zero birefringence. It is thus possible to plot any non-opaque mineral on the graph. This treatment has the further advantage of accommodating those minerals possessing variable optical properties that cannot be strictly categorized as isotropic, uniaxial, biaxial positive, or biaxial negative.
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