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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of mineral Buergerite is indicated by NaFe3Al6Si6O18(BO3)3O3F or Sodium Iron Aluminum Boro-silicate Oxide Fluoride. Buergerite is actually a Silicate mineral. Mineral species Buergerite was named in honor of Martin J. Buerger (1903-1986), a Professor of Mineralogy at the Massachusetts Institute of Technology and also a pioneer of crystal structure analysis. Buerger is also the one who invented the X-ray precession camera permitting undistorted photography of the reciprocal lattice. This Buergerite mineral species was discovered in the year 1966 at San Luis Potosi in Mexico. Buergerite minerals are commonly associated with those minerals, which are found in the volcanic rocks. They are only used as mineral collection specimens.     Buergerite mineral was actually considered as an unusual variety of schorl during the time when it was first discovered. But the iron found in schorl is in the positive 2-oxidation state, which is very different from the positive three-oxidation state of iron in the Buergerite mineral. Because of this property, Buergerite mineral is considered a rather unusual tourmaline. Buergerite mineral retains its tourmaline structure and most of its tourmaline characteristics despite of all the chemical mayhem that exist.

 

            Buergerite minerals are commonly found brown in color in both reflected and transmitted light of petrographic polarizing microscopes used in optical mineralogy. Buergerite mineral is also commonly found exhibiting a vitreous luster in reflected light of polarized microscope for mineralogists. When mineral specimens of Buergerite are evaluated between polarizing light microscopes used in the field of optical mineralogy, they commonly display absent cleavage although there is a basal parting found.  Buergerite mineral also exhibits an uneven fracture as found when the specimen is evaluated under several adjustments on the aperture diaphragm of polarizing light microscope used in optical mineralogy. The hardness measure of Buergerite mineral when it is evaluated using the Mohs scale method is usually found in a range of 7 to 7.5. Buergerite mineral is most commonly found leaving an off white streak specimen is rubbed on a white porcelain streak plate. The specific gravity measure of Buergerite mineral is commonly found 3.3+ grams per cubic centimeters, which is commonly considered slightly heavier than average.

 

            Buergerite mineral crystals are known to crystallize in the trigonal system of crystal formation. Buergerite crystals are commonly found translucent to opaque in appearance. The crystal habits of Buergerite mineral commonly include those typically elongated three sided prisms, which are seen clearly visible under a polarizing microscope for mineralogists. The crystals can be found terminated by either a flat basal face or maybe by a simple to complex trigonal pyramid. There can be a lengthwise striation found in the prism face of Buergerite mineral that can be seen clearly visible with the aid of petrographic polarizing light microscope used in optical mineralogy. The cross sections of tourmalines commonly appear predominantly triangular in shape and usually with some crystals showing a hexagon form, which can be seen clearly exhibited under a polarized microscope for mineralogists. Minerals like Buergerite that are doubly terminated are considered hemimorphic. In optical mineralogy, this means that the two ends of their crystals are not really exactly alike. Buergerite minerals are also found as massive specimens. Buergerite crystals are usually found brittle, a property that is often displayed by glasses and most non-metallic minerals. Buergerite minerals are also known as pleochroic and piezoelectric. Buergerite has a maximum birefringence that is commonly found 0.080. Buergerite mineral is found as uniaxial negative figure under a petrographic polarizing light microscope used in the field of optical mineralogy. The refractive index of mineral specimen Buergerite is commonly found 1.735 to 1.655. When Buergerite mineral specimens are evaluated under a polarizing light microscope for mineralogists, they are commonly found displaying a high surface relief. There is no specific data on the toxicity and health danger for mineral Buergerite. However, the specimens of Buergerite should be treated with great care and use of sensible precaution is advised upon handling them. Buergerite minerals are also thought to be probably pneumatolytic in origin. They can be also found in cavities in rhyolite. The best field indicators of Buergerite mineral usually include color, its triangular cross section, environment, crystal habit and hardness. Mineral Buergerite has limited occurrence in San Luis Potosi in Mexico. It can be also found some types of localities in Brazil and also in the Czech Republic.



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Friday, January 15th, 2010 at 4:53 am
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The Silicates Mineral Class
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