Interference colour chart optical mineralogy an interference colour chart , first developed by Auguste Michel-Lévy , is a tool to identify minerals in thin section using a petrographic microscope . With a known thickness of the thin section , minerals have specific and predictable colours in cross-polarized light , and this chart can help identify minerals. The colours are produced by the difference in speed in the fast and slow rays , also known as birefringence .Isotropic and opaque minerals cannot be identified this way. The stage of the microscope should be rotated until maximum colour is found, and therefore , the maximum birefringence. Each mineral , depending on the orientation , may not exhibit the maximum birefringence. It is important to sample a number of similar minerals in order to get the best value of birefringence. Uniaxial minerals can look isotropic if the mineral is cut perpendicular to the optic axis.
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