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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, it is customary to first examine the rock and mineral samples under the petrographic polarizing microscope either as very thin section or as very fine grains. This is for the reason that many minerals are not transparent except as very small grains. Optical mineralogy further made some standard procedures on examining mineral samples. More importantly, birefringence and interference colors are usually most easily measured by observing the minerals in thin sections under petrographic polarizing light microscopes of known thickness.

 

            It has been also known in the field of optical mineralogy that thin sections and grain mounts both have their particular advantages and disadvantages. As discussed in the field of optical mineralogy, the thin sections enable minerals to be identified, and allow grain sizes and textural relationships in rocks to be examined. Moreover, the section is permanent and easily stored. On the other hand, thin sections are relatively expensive and time-consuming to make. A crushed grain mount is the quickest and most economical means of identifying an unknown mineral. more importantly, crushed-grain mount allows a much more accurate refractive index determination compared to thin sections when evaluated with the aid of petrographic polarizing microscope used in optical mineralogy. However, no grain-size or textural information is gained, and the mounts are not normally permanent or easy to store. Loose-grain mounts may be the best way to examine sediments that are unconsolidated or easily disaggregated, since they enable the sedimentologists to determine grain size and shape as well as to identify the minerals.



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Tuesday, December 29th, 2009 at 2:36 pm
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Optical Mineralogy
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Click Here For Best Selection Of High Quality Polarizing Microscope