فیلم های علمی و آموزشی
صفحهها
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Optical Mineralogy calcite cross-polarized light
Calcite in plane polarized and cross polarized light, showing various interference colors and twins.
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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.
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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.
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