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Tag «Isotropic and An-isotropic minerals»

Observations in convergent light

If we examine the sections of an-isotropic minerals under a convergent polarized light, the ”interference figures” can be seen. In order to observe these figures, we need to make some pre-adjustments in the polarizing microscope. Polars are crossed. Condenser lens is used below the stage to produce a converging beam. A high power objective is …

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 …