Pleochroismus

as Pleochroismus one designates the multi colorness of minerals in the mineralogy with view from different lines of sight. The cause for it is the unequal absorption of the light dependent on the crystal structure of the mineral, for example Cordierit.

The dichroism is a special form of the Pleochroismus with exacttwo different colouring.

The pleochroistischen characteristics of a mineral can be determined assistance of a Dichroskops and be used for the regulation and examination particularly with jewels.