فیلم های علمی و آموزشی
صفحهها
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Optical Mineralogy - Extinction in Quartz
Built in polarizing filter in the computer screen + polarizing sunglasses + quartz crystal = optical mineralogy experiment. Voila': optical extinction of a whole quartz crystal
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Mineralogy 02 - Crystal Structure, Forms, Miller Indices, Symmetry Elements | Geology Concepts
Crystal structure : Classification of solids based on arrangement Elements of crystal forms Miller indices Common forms in Crystallograpy Elements of symmetry Classification of Solid based on symmetry
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Optical Mineralogy clinopyroxene inclined extinction
Sodic clinopyroxene (omphacite) in plane polarized and cross polarized light, showing inclined extinction (extinction when cleavage planes are inclined with respect to the crosshairs). Note garnet that is isotropic (black) in cross-polarized light.
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