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The chemical formula of mineral Ullmannite is indicated by NiSbS or Nickel Antimony Sulfide. It is actually a Sulfide mineral. Ullmannite is considered as a minor ore of nickel and it is most commonly used as mineral specimen and is often fund showing nice and interesting microscope images when viewed with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. Ullmannite was named after the German chemist and mineralogist, J. C. Ullmann. Ullmannite is a rare nickel mineral that belongs to the Cobaltite Group of minerals. The mineral members of this group including mineral Ullmannite is usually found forming nice and interesting crystals in cubic, tetrahedral, octahedral or even pyritohedral form. Ullmannite is very similar to a nickel arsenic sulfide called gersdorffite. The rarer Ullmannite mineral usually has some arsenic in its chemistry anyways. The two minerals are almost indistinguishable by ordinary means.

             Mineral Ullmannite is most commonly found steel gray, silver to tin white in color that could appear more interesting and fascinating when viewed with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. Ullmannite is also found showing metallic luster when viewed in reflected light of polarized microscopes for mineralogists. Most crystals of mineral Ullmannite are found opaque in appearance. Ullmannite is known to crystallize in the isometric system of crystal formation. In optical mineralogy, this isometric crystal system comprises crystals having three axes, all of which are perpendicular to one another and all are found equal in lengths. The crystal habit of mineral Ullmannite as described in the field of optical mineralogy usually include cubic, octahedral, tetrahedral and pyritohedral crystals as well as massive and granular forms that can be seen more interesting when viewed with the aid of petrographic polarizing microscopes for geologists.              Mineral Ullmannite is usually found showing good cleavage in three directions forming cubes that can be found more splendidly exhibited when specimen is viewed with the aid of polarizing microscopes for mineralogists. It is also usually found showing uneven fracture when viewed with the aid of polarizing microscopes used in the field of optical mineralogy. The hardness measure of the mineral Ullmannite when it is evaluated using the Mohs scale method is usually ranging from 5 to 5.5. Mineral Ullmannite is most commonly found leaving a black streak when specimen sample is rubbed on a white porcelain streak plate, which is considered heavier than average for metallic minerals. The specific gravity measure of the mineral Ullmannite is usually ranging from 6.6 to 6.7 grams per cubic centimeters, which is heavier than average for metallic minerals. Ullmannite crystals are sometimes striated which can be seen more clearly visible when viewed with the aid of polarizing microscopes used in the field of optical mineralogy. Ullmannite is most commonly found associated with pyrite, quartz, sphalerite, niccolite, calcite, galena and some iron minerals. The best field indicators of mineral Ullmannite usually include cleavage, crystal habit, hardness and density. Ullmannite notably occurs at some localities including Germany, Britain, Austria, France, England and some areas in USA.



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Sunday, August 30th, 2009 at 3:52 am
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The Sulfides Mineral Class
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