فیلم های علمی و آموزشی

Optical Mineralogy calcite cross-polarized light

Calcite in plane polarized and cross polarized light, showing various interference colors and twins.‎

Optical Mineralogy hornblende inclined extinction plagioclase

Hornblende and plagioclase in plane-polarized and cross-polarized light, showing inclined extinction in hornblende (extinct when cleavage planes are inclined with respect to the crosshairs) and twinning in plagioclase (light and dark bands).‎ Hornblende shows green pleochroism.‎ High relief grains are orthopyroxene.‎

Optical mineralogy calcite variable relief

Calcite in plane polarized and cross polarized light, showing variable relief against quartz (plane polarized light) - note variable darkness of grain boundary in center of field of view.‎ In cross-polarized light, calcite shows high interference colors and twins.‎ Quartz shows typical black-white colors in cross-polars.‎

Optical Mineralogy pleochroic halo extinction biotite

Biotite with a radiation damage halo developed around an accessory mineral (likely zircon or monazite), showing pleochroism in plane polarized light, and birds-eye extinction (mottled appearance) in cross-polarized light.‎

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