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Tag «optical properties of 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 …

Examination of Minerals in Cross Polars

Examination of Minerals in Crossed Polars: When the analyzer is placed in the position with its plane of polarization at right angles to that of the polarizer, the polars are said to be ”crossed”. If a section of a doubly refracting mineral is placed between crossed polars, the light is doubly refracted and polarized three …

Isotropic and anisotropic minerals

Depending upon the optical properties, the minerals can be divided into two groups: (i) isotropic minerals and (ii) anisotropic minerals. Isotropic Minerals: In crystals belonging to the cubic system, the light travels with the same velocity in all directions and therefore each mineral has only one refractive index. Such minerals are called ”isotropic minerals”. Non-crystalline …

Optical Properties of Minerals

The optical properties of minerals are important for their identification. Optical properties are determined with the help of a ”polarizing microscope”. The study of optical properties of minerals is known as Optical Mineralogy. With the help of optical mineralogy, we study the minerals and rocks with the help of their optical properties. The rocks and …