Website Earth Science, Geography, Geology, Engineering Geology, Oceanography, Meteorology, Astrononomy, Human Geography, Environmental Sciences, mapping, map usa types of extinctions Archives - Geo Studies Organization

Tag «types of extinctions»

Extinction Direction of the minerals during optical analysis

When vibration directions of an anisotropic mineral coincide with those of the polarizer and analyzer, the mineral appears dark. This position of an anisotropic mineral is called ”position of extinction”. During a complete rotation of the microscope stage, the position of extinction occurs four times at 90┬░┬áintervals. In extinction position, the light from the polarizer …