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The chemical formula of mineral Bismuthinite is indicated by Bi2S3 or Bismuth Sulfide. Bismuthinite is actually a Sulfide mineral. Bismuthinite minerals are considered as important ores of bismuth. These ore minerals are usually found having splendid and interesting microscope images under an ore polarizing light microscope. The most spectacular specimens of Bismuthinite that is considered somewhat rare character that can be found with sulfide minerals are the sprays of prismatic crystals, usually in steel gray color, that commonly radiate outward from a common attachment point. These types of Bismuthinite mineral specimens are commonly compared to the stibnite minerals. Bismuthinite minerals are usually difficult to distinguish from its close relative antimony sulfide, which is known to be very similar looking with Bismuthinite. However, it has been known that Bismuthinite minerals are actually heavier than stibnite. It can be also found on closer inspection using the petrographic polarizing light microscope that there really exists a very noticeable difference on the physical appearance of Bismuthinite when compared to stibnite. Bismuthinite are actually found having a much straighter and flatter faces than stibnite. But if two minerals are found in massive forms, the confusion upon identification of which is which is very much pronounced. But it can be also noted that Bismuthinite is actually not associated with the typical antimony or arsenic minerals, which are commonly found allied with stibnite minerals.

 

            The associations of Bismuthinite minerals with several other interesting minerals are actually varied. But when it is found combined with the rare elemental mineral Bismuth, it is considered very special. Bismuthinite has another especially common associate known as chalcopyrite. Bismuthinite mineral is also found having an alteration or oxidation product that is often found as pseudomorphic crystals after bismuthinite. This alteration product of Bismuthinite is actually a carbonate mineral known as Bismutite. A pseudomorph is actually an atom-by-atom replacement of one mineral by another. But this actually happens without any significant changes in the physical or outward appearance of the mineral crystals.

 

            Bismuthinite minerals are commonly found in shades of steel gray to off-white in reflected light of petrographic polarizing microscope used in the field of optical mineralogy. The cleavage found is commonly perfect in one lengthwise direction when mineral specimen Bismuthinite is evaluated between crossed nicols of polarizing microscope for geologists. They are commonly found exhibiting a metallic luster in reflected light of polarized microscopes for mineralogists. Bismuthinite is usually found having uneven fracture when mineral specimen is evaluated under several adjustments on the aperture diaphragm of polarizing microscopes used in the field of optical mineralogy. The hardness measure of mineral specimen Bismuthinite using the Mohs scale method is commonly found to be 2. This is considerably soft that can be easily scratch by a fingernail. When specimens of mineral Bismuthinite are rubbed on the white porcelain plate, they are commonly found leaving a white streak. The specific gravity measure of Bismuthinite commonly gives an approximate value that is usually found ranging from 6.8 to 7.2 grams per cubic centimeters, which is considered well above average for metallic minerals.

 

            Bismuthinite minerals are known to crystallize in the orthorhombic system of crystal formation. In the field of optical mineralogy, this crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths. Bismuthinite crystals are commonly found opaque in appearance. The crystal habits of Bismuthinite as described in optical mineralogy commonly include radiating acicular to prismatic columnar crystals, which are usually found exhibiting a wonderful and fascinating microscope views under petrographic polarizing light microscope for mineralogists. As mentioned before, they can be also found in majestic sprays, which are very similar to that of stibnite minerals. These are actually the needle-like prismatic crystals that are commonly striated. Prismatic crystals are actually shaped like slender prisms. They can be also found in granular or massive forms. Granular formations are generally occurring, as anhedral to subhedral crystals in matrix. Massive and lamellar crystals are usually found in distinctly foliated fine-grained forms. They may be also found as compact to grainy aggregates and also as fibrous or foliated crystals. Bismuthinite crystals are usually found slightly flexible but are considered inelastic. They are may be found having a slight yellow or may be an iridescent tarnish. Bismuthinite crystals are usually found striated. Sometimes, they can be found sectile. Bismuthinite crystals are rarely found in free growing slender form. They are more often found in embedded masses usually with fibrous or bladed structures.

 

            Bismuthinite minerals do not actually fuse in a flame of a match. Bismuthinite powder is also usually found soluble in hot concentrated nitric acid, usually leaving flaky particles of sulfur on the mineral surface. There is no specific data on the toxicity and health dangers for mineral Bismuthinite. However, the specimens of this mineral should be treated with great care and use of sensible precaution is advised upon handling them. Bismuthinite minerals are also non-magnetic and are also found not radioactive after several chemical evaluations. Mineral Bismuthinite is commonly associated with numerous interesting minerals including bismuth, gold, barite, quartz, bismutite, chrysoberyl, andradite, pyrophyllite, alamandine, scheelite, kettnerite, gadolinite, beryl, pyrite, wulfenite, chalcopyrite, wolframite, epidote, covellite, microline, arsenopyrite and several other sulfide minerals. Bismuthinite minerals are commonly found in high temperature hydrothermal veins. They can be also found in tourmaline bearing copper deposits in granite. Sometimes they are formed in some gold veins that are formed at high temperatures. Bismuthinite minerals are also formed in recent volcanic exhalation deposits and in low temperature hydrothermal deposits. The best field indicators of Bismuthinite usually include tarnish, flexibility, softness, density and also crystal habit. Bismuthinite minerals notably occur at some types of localities that include Australia, England, Bolivia, Canada, Brazil, Germany, Mexico, as well as some areas in the United States such as Arizona, Colorado, Connecticut, and California and also in Beaver County, Utah.



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Friday, January 15th, 2010 at 4:42 am
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The Sulfides Mineral Class
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