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The chemical formula of mineral Walpurgite is indicated by (BiO)4UO2(AsO4)2 – H2O or Hydrated Bismuth Uranyl Arsenate Oxide. Walpurgite is actually a Phosphate mineral. It is considered as a very minor ore of uranium and bismuth. It is also commonly used as mineral specimen and is most often found showing nice and interesting images when viewed with the aid of petrographic polarizing light microscopes used in optical mineralogy. Walpurgite is actually a chemical oddball of a mineral. It has uranium, arsenic and bismuth in its chemical formula. The high density and luster of mineral Walpurgite is brought about by bismuth in its chemical content. Walpurgite is too rare to be considered as an ore of either uranium or bismuth. However, it cannot be denied that Walpurgite has gone into the processing with other ores.

 

            Mineral Walpurgite can have attractive specimens in tiny clusters of bladed radiating crystals that could appear more splendidly exhibited when viewed with the aid of polarizing microscope used in optical mineralogy. Walpurgite was named after its type of locality at Walpurgis Vein in Weisser Hirsh Mine at Schneeberg, Saxony, Germany. Walpurgite is a radioactive mineral and it should be stored away from other minerals that are affected by radioactivity and human exposure should be limited. Walpurgite is commonly found exhibiting its typical yellow color but it can be also found reddish orange that appears more fascinating and interesting when viewed with the aid of polarized microscopes for mineralogists. Walpurgite is also usually found showing adamantine to greasy luster in reflected light of petrographic polarizing microscope used in optical mineralogy.

 

            Most crystals of mineral Walpurgite are found translucent to rarely transparent in appearance. Walpurgite is known to crystallize in the trigonal system of crystal formation. The crystal habit of mineral Walpurgite as described in the field of optical mineralogy usually include platy elongated crystals that are often aggregated and twinned which can be found more clearly visible when viewed with the aid of petrographic polarizing light microscopes for mineralogists. Walpurgite can be also found in crusts, fibrous and earthy form that can be found more interesting when viewed under polarized microscopes for mineralogists.

 

            Mineral Walpurgite is most commonly found showing perfect cleavage when viewed with the aid of polarizing microscope used in optical mineralogy. It also shows lamellar fracture that can be seen more clearly visible when closely evaluated under petrographic polarizing microscope used in optical mineralogy. The hardness measure of the mineral Walpurgite when it is evaluated using the Mohs scale method is usually 3.5. Mineral Walpurgite is most commonly found leaving a pale yellow streak when specimen sample is rubbed on a white porcelain streak plate. The specific gravity measure of the mineral is approximately 5.95 to 6.69 grams per cubic centimeters, which is considered well above average for translucent minerals. Walpurgite is a radioactive mineral with surprisingly brittle cleavage sheets. It is also known as a non-fluorescent mineral. Walpurgite is usually associated with other interesting minerals including Uraninite, torbernite, bismutite, zeunerite and other uranium minerals. The best field indicators of mineral Walpurgite usually include associations, color, non-fluorescence, crystal habit, radioactivity and high density. Walpurgite notably occurs at several localities including its type of locality at Weisser Hirsch Mine in Schneeberg, Saxony, Germany and also at Miracle Mine at Kern County, California, USA.



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Thursday, October 15th, 2009 at 4:13 am
Category:
The Phosphates Mineral Class
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