Types of extinction

Extinction in crystallography, mineralogy, and economic geology refers to the darkening of a mineral under crossed polarized light in a petrographic microscope. It occurs when the vibration directions of light passing through a mineral align with the polarizer or analyzer. There are several types of extinction observed in minerals. ___ ________ _____ _______ _________ _________ ____ _____ __________ _______ ________ _______.
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