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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 optical mineralogy, the standard modern thin section is close to 0.03 mm in thickness. It is then easy for the student to confirm this provided a mineral of known birefringence has already been identified in the section with the aid of polarizing microscope for mineralogists. Quartz is ideal for the purpose since it is common, easily identified, and of constant birefringence. Feldspar and other minerals may be used but with less accuracy.

 

            It was studied in optical mineralogy that Quartz has a birefringence of 0.009 when specimen is evaluated with the aid of polarized microscopes. With some observations made, it can be seen that in a section of 0.03 mm thickness there should be a few grains with 1st-order pale yellow interference colors that can be seen more clearly visible when viewed with the aid of petrographic polarizing light microscopes. If there are none, the section is thinner than normal. If there are grains with orange interference colors, it is thicker than normal. With some experience it is possible to determine the thickness within 0.01 mm. It is however important to note that a thin section may vary a little in thickness.      



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Friday, October 30th, 2009 at 2:53 pm
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Optical Mineralogy
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Click Here For Best Selection Of High Quality Polarizing Microscope