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The chemical formula of mineral Knaufite is indicated by Cu3V2O7(OH)2 – 2H2O or Hydrated Copper Vanadate Hydroxide. This is actually a mineral Volborthite. Knaufite is the old name of mineral Volborthite and it is now considered as synonym of this volborthite mineral species. Knaufite is actually a Phosphate mineral. Volborthite, a rare copper vanadate mineral, was named after Aleksander Fedorovich van Volborth, a Russian paleonthologist. It was actually first named Knaufite, which is still considered a synonym of the mineral. Mineral Knaufite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis.

 

Mineral Knaufite or Volborthite is most commonly used as mineral specimen and it is often found exhibiting a nice and fascinating appearance when viewed under geological polarizing light microscopes. This mineral Knaufite or Volborthite is actually not related to the mineral calciovolborthite. Except of course for the fact that both minerals are vanadate hydroxides. Mineral Volborthite or Knaufite has the water molecules in its chemical formula but lacks the calcium ions. Mineral Knaufite or Volborthite has basic structure which is sheet-like structure having oxide or hydroxide layers that are held together by the pyrovanadate groups. Then the layers of water usually stack these layers.

 

            Mineral Knaufite is commonly found having yellow to green yellow to light brown color that is much more wonderful when viewed under petrographic polarizing light microscope used in optical mineralogy. Knaufite is also most commonly found showing vitreous, pearly or dull luster when mineral is viewed in reflected light of polarized microscope used in optical mineralogy. The cleavage that is commonly exhibited by mineral Knaufite or volborthite is usually imperfect when it is viewed under polarized light microscopes used in optical mineralogy. The specific gravity measure of the mineral Knaufite or volborthite usually gives an approximate value ranging from 3.4 grams per cubic centimeters to 3.5 grams per cubic centimeter, which is considered heavy for non-metallic minerals. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually found 3.5. Knaufite is commonly found leaving a pale green streak when the mineral specimen is rubbed on a white porcelain streak plate.

 

            Most crystals of mineral Knaufite or volborthite are found translucent to opaque in appearance. The crystal habit of mineral Knaufite as described in optical mineralogy usually includes the typical encrusting or rounded masses that are often majestically exhibited under petrographic polarizing microscope for mineralogists. Sometimes it can be also found as individual scales that are usually interesting when evaluated under polarized microscopes used in optical mineralogy. It also exhibits a pearly luster in reflected light of polarizing microscope. Lamellar twinning can be also found exhibited by the mineral when it is examined more closely with the aid of polarizing light microscope for geologists. Mineral volborthite or Knaufite usually form encrusting masses with a beautiful yellow green coloration that is usually majestically exhibited under petrographic polarizing microscopes used in optical mineralogy. Mineral Knaufite is a non-fluorescent mineral under ultra violet light.

 

            The best field indicators of mineral Knaufite usually include color, density, locality and its non-fluorescent property. Mineral Knaufite notably occurs at several localities including the Ural Mountains of Russia, some areas in the United States such as Arizona and the Carlin Gold Mine in Nevada as well as Mount Vesuvius in Italy, Cornwall in England, some areas in Japan, Australia, Czech Republic, Chile, Austria and Canada.



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Monday, February 16th, 2009 at 2:48 am
Category:
The Phosphates Mineral Class
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