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The chemical formula of mineral Norbergite is indicated by Mg3SiO4(F,OH)2 or Magnesium Silicate Fluoride Hydroxide. This Norbergite is actually a Silicate mineral. Norbergite is only used as mineral specimen and it is most often found exhibiting nice and interesting appearance when viewed with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. Norbergite is actually one of the several rare minerals from Franklin, New Jersey. They are actually one of the many fluorescent minerals that are valuable to collect. Mineral Norbergite actually glows tan to yellow color when subjected to shortwave ultraviolet light. Mineral Norbergite is often found associated with other fluorescing minerals like diopside and calcite. The combination of the fluorescing colors can be quite attractive. Mineral Norbergite was actually first discovered in Norberg, Sweden and this mineral is named after this type of locality. Norbergite is usually found forming small grains in the marbles of contact metamorphic environments.

 

            Mineral Norbergite is most commonly found white, yellow, tan, brown, orange or red that could appear more splendid when viewed with the aid of petrographic polarizing light microscopes used in optical mineralogy field. Norbergite is usually found exhibiting a vitreous to resinous luster when viewed in reflected light of polarized microscope for mineralogists. Most crystals of mineral Norbergite are found transparent to translucent in appearance. Norbergite is known to crystallize in the orthorhombic system of crystal formation. In optical mineralogy, this orthorhombic crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths. The crystal habit of mineral Norbergite as described in the field of optical mineralogy includes small prismatic to rounded crystals. But most often, as is most commonly the case, as embedded indistinct grains.

 

            Norbergite is also most commonly found showing poor basal cleavage in one direction which can be seen more clearly exhibited when specimen is closely evaluated with the aid of polarizing microscopes used in the field of optical mineralogy. It is also usually found showing subconchoidal fracture when viewed under geological polarized microscope. The hardness measure of the mineral Norbergite when it is evaluated using the Mohs scale method is usually ranging from 6 to 6.5. Norbergite is most commonly found leaving a white streak when specimen is rubbed on a white porcelain streak plate. The specific gravity measure of the mineral Norbergite is usually found ranging from 3.1 grams per cubic centimeters to 3.2 grams per cubic centimeters. Many Norbergite specimens are found fluorescing a tan to yellow color under shortwave ultraviolet light most especially those that are of a lighter. The best field indicators of mineral Norbergite usually include color, associations, environment of formation, fluorescence, and hardness. Norbergite is also most commonly found associated with other interesting minerals such as franklinite, spinel, tremolite, calcite, diopside, chondrodite, fluoritepyrrhotite, and dollaseite-Ce. Norbergite notably occurs at its type of locality at Ostanmosoa Iron Mine, Norberg, Sweden as well as Franklin, New Jersey, USA and in Canada. It can be also found in Finland and Italy.



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Friday, May 15th, 2009 at 3:21 am
Category:
The Silicates Mineral Class
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