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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

In the field of optical mineralogy, birefringence is defined as the maximum possible difference in refractive indices of a mineral. The determination of birefringence or partial birefringence of a mineral section can be done by observing interference colors in crossed-polarized light of petrographic polarizing microscope used in optical mineralogy. The microscope set up should have the diaphragm positioned below the stage open and a low- to moderate-power objective should be used. Using the Michael-Levy colour chart, the values of birefringence are represented by lines radiating from the lower left hand corner of the diagram. The thickness of the mineral section on the other hand is represented by horizontal lines, and the interference colors are the vertical lines. Basically, the technique is used to determine the thickness of the mineral section and the interference color.



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Friday, October 30th, 2009 at 2:52 pm
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Optical Mineralogy
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Click Here For Best Selection Of High Quality Polarizing Microscope