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The chemical formula of mineral Vauxite is indicated by FeAl2(PO4)2(OH)2 – 6H2O or Hydrated Iron Aluminum Phosphate Hydroxide. Vauxite is actually a Phosphate mineral and it is most commonly used as mineral specimen and is often found exhibiting nice and interesting microscope appearance when viewed with the aid of petrographic polarizing light microscopes for mineralogists or the ones used in the field of optical mineralogy. Vauxite is an iron mineral with unusual blue color. It is considered unusual in the sense that, as a coloring agent, iron can actually produce any color in the rainbow but commonly produces reds, browns and yellows that appear more interesting when viewed with the aid of polarizing microscopes for geologists. Mineral Vauxite is also known to be closely related to the often associated mineral Paravauxite. The two minerals differ only in the number of water molecules in their structure. However, the presence of these water molecules alters the structure to the point that Paravauxite has perfect cleavage while in sharp contrast while Vauxite has no cleavage at all. The only other significant differences between the two include the green to colorless color of mineral Paravauxite and the blue color of Vauxite. The two above mentioned minerals along with metavauxite, the polymorph of Paravauxite are all found at the famous tin oxide deposits at Llallagua, Potosi, Bolivia. All these three are associated with the primary tin ore, cassiterite. They also form as a result of precipitation from hydrothermal solutions.

             Mineral Vauxite is moos commonly found pale to dark blue in color that could also appear more fascinating when viewed with the aid of petrographic polarizing microscopes used in optical mineralogy. Vauxite is also most commonly found showing vitreous luster when viewed in reflected light of petrographic polarizing microscopes. Most specimens of mineral Vauxite are found translucent to transparent in appearance. The crystal habit of the mineral as described in the field of optical mineralogy usually include tabular crystals and radiating fibrous clusters that can be seen more fascinating when viewed under polarized microscopes for mineralogists. Mineral Vauxite is also known to crystallize in the triclinic system of crystal formation. In optical mineralogy, this triclinic crystal system commonly comprises crystals having three axes, of which all are unequal in length and are positioned oblique to one another. 

            Mineral Vauxite has absent cleavage even when closely evaluated with the aid of petrographic polarizing microscope used in optical mineralogy. Vauxite also shows conchoidal fracture when specimen samples of the mineral is closely evaluated with the aid of polarized microscopes for mineralogists. The hardness measure of Vauxite when it is closely evaluated using the Mohs scale method is usually found 3.5. Vauxite specimen samples are most commonly found leaving a white streak when rubbed on a white porcelain streak plate. The specific gravity measure of the mineral is approximately 2.4 grams per cubic centimeters, which is considered average value. Vauxite is most commonly found associated with other interesting minerals including limonite, cassiterite, quartz, metavauxite, Paravauxite and wavelite. The best field indicators of mineral Vauxite usually include color, crystal habit, associations, locality and lack of cleavage. Vauxite has limited occurrence at the famous tin deposits at Llallagua, Potosi, Bolivia and in some few minor localities around the world.

 



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Wednesday, September 30th, 2009 at 3:44 am
Category:
The Phosphates Mineral Class
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