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Accessory plates used with polarizing microscope

There are some standard accessory plates used with a polarizing microscope to examine the optical properties of minerals. Some of the accessory plates are (i) quartz wedge, (ii) gypsum plates, and (iii) mica plates. (1). Quartz Plates: The quartz wedge is a very thin wedge-shaped plate of quartz in which the fast vibration direction is …

Optical Indicatrix of Minerals

In anisotropic minerals, the refractive index varies with the crystal direction. This relationship can be illustrated with the help of a geometrical figure called the ”optical indicatrix”. The optical indicatrix of an anisotropic crystal is an ellipsoid whose semiaxes are proportional to the refractive indices in the respective directions. In the crystals of cubic system …