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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of mineral Microcline is indicated by KAlSi3O8 or Potassium Aluminum Silicate. Microcline is actually a Silicate mineral. It is also a member of the feldspars. Microcline is used as ornamental stone. In industry, it is used in the manufacturing of glass, enamel, and porcelain products. Microcline is also used as mineral specimen and it is most often found exhibiting interesting and splendid images when viewed with the aid of the polarizing microscopes used in the field of optical mineralogy. Microcline is not so well-known mineral and it has been used as semi-precious stone under the names Amazonite and Perthite. Amazonite is a variety that is deep green and is suitable for carving and polishing. The perthite variety is a stripped, veined or almost zebra patterned stone that is produced from lamellar intergrowths inside the crystal. These intergrowths result from compatible chemistries at high temperatures becoming incompatible at lower temperatures and thus a seperating and layering of these two phases. The colored stripes are microcline and the white or clear stripes are plagioclase feldspar. If there is more plagioclase than microcline it is called “antiperthite”.

            Mineral Microcline is actually a polymorph of other minerals that share the same chemistry but they have different crystal structure. Microcline is usually found off white, yellowish, flesh pink, brown or green in color that could appear more fascinating when viewed with the aid of polarizing microscope. Microcline is also most commonly found showing vitreous to sometimes pearly or dull luster if weathered when specimen is evaluated under polarized microscopes. Microcline is usually found showing perfect cleavage in one direction and good in another direction forming nearly right angled prisms. Microcline is also commonly found exhibiting conchoidal fracture when specimen is viewed with the aid of petrographic polarizing microscope. When mineral specimen of Microcline is rubbed on a white porcelain streak plate, it is commonly found leaving a white streak.

            Most Microcline crystals are found translucent, but usually translucent to opaque in appearance. Microcline is known to crystallize in the triclinic system of crystal formation. The crystal habit of the mineral Microcline usually includes blocky or tabular crystals. Microcline crystals have nearly rectangular or square cross-section with slightly slanted dome and pinacoid terminations. Microcline crystals are commonly twinned. Lamellar twinning may cause a grooved effect on crystal and cleavage surfaces that appear as striations. Perthite intergrowths causes a stripped appearance is some specimens. The hardness measure of the mineral Microcline when it is evaluated using the Mohs scale method is usually ranging from 6 to 6.5. The specific gravity measure of the mineral is approximately 2.5 grams per cubic centimeters, which is considered average.

            Microcline is most commonly found as a major rock forming component in granites, syenites and in metamorphic gneisses. Microcline is most commonly found associated with interesting mineral such as quartz, muscovite, and plagioclase feldspar. The best field indicators of mineral Microcline include occurrence, twinning, color, and luster. Microcline notably occurs at several localities including Russia, Norway, Madagascar, and some areas in USA.



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Thursday, April 16th, 2009 at 2:30 am
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The Silicates Mineral Class
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