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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of mineral Carnotite is indicated by K2(UO2)2(VO4)2-1 – 3H2O or Hydrated Potassium Uranyl Vanadate. Carnotite is actually a Phosphate mineral. Carnotite is also commonly used as a mineral specimen, which is usually found exhibiting an interesting and splendid microscope image in transmitted light of petrographic polarizing light microscope. Carnotite was first discovered in the year 1899 at Raja Mine in Colorado in the United States. Carnotite was actually named after Marie Adolphe Carnot (1839-1920), a French chemist and also a mining engineer. Carnotite has several mineral varieties such as tyuyamunite and margaritasite. Carnotite 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.

 

            Carnotite ore minerals are also displaying an interesting image when viewed with the aid of an ore polarizing microscope. These two minerals, the vanadium and uranium, are actually considered as extremely strategic metals. Carnotite is also found to be closely related to mineral tyuyamunite whose chemical formula is indicated by Ca(UO2)2(VO4)2-5 – 8H2O. The chemistries of tyuyamunite and Carnotite are actually very similar with potassium replacing calcium but with the water percentage found different. The structures of the two minerals however are slightly different. Tyuyamunite minerals are commonly found crystallizing in an orthorhombic crystal formation while Carnotite is in monoclinic system of crystallization. Carnotite and tyuyamunite minerals are often found together and by ordinary means, they are actually indistinguishable. Carnotite is also known as a radioactive mineral. Thus, mineral specimens of Carnotite should be stored away from other minerals, which are prone to radioactivity effects. Human exposure should be also limited.

 

            Carnotite is most commonly found exhibiting bright yellow shade. Carnotite is usually found exhibiting a pearly to dull or earthy luster in reflected light of petrographic polarizing microscope used in optical mineralogy. Carnotite is also most commonly found showing perfect cleavage in only one direction when it is evaluated between crossed nicols of polarizing light microscope for mineralogists. Carnotite also shows uneven fracture under several adjustments on the aperture diaphragm of the petrographic polarizing light microscope. The flat surfaces of mineral Carnotite are commonly fractured in an uneven pattern and these are usually more clearly visible when viewed under petrographic polarizing microscopes used in the field of optical mineralogy. Carnotite is considered very soft and is also heavy and fragile mineral. The hardness measure of Carnotite when it is evaluated using the Mohs scale method is commonly 2. Carnotite is most commonly found leaving a yellow streak when specimens are rubbed on a white porcelain streak plate. The specific gravity measure of mineral Carnotite usually gives an approximate value that is ranging from 4 to 5, which is commonly heavy for translucent minerals. The density of the Carnotite mineral depends on its water content. The water content of mineral Carnotite varies at ordinary temperatures from one to three molecules. However, minerals with lower water content have higher gravity.

 

            Carnotite mineral crystals are commonly found translucent to opaque in appearance. In the field of optical mineralogy, it has been found that opaque materials commonly appear black when viewed between crossed nicols of polarizing light microscope. The crystal habit of Carnotite as described in optical mineralogy commonly includes crusts and earthy masses that are usually very interesting to view under polarized light microscope. Carnotite mineral can be also found as foliated crystals and sometimes as granular aggregates that are commonly exhibiting nice and splendid microscope image under a petrographic polarizing microscopes used in optical mineralogy. They can be also found having earthy to dull or clay like texture with no visible crystalline affinities. Carnotite minerals as encrustrations are commonly forming crust like aggregates on matrix, which are very interesting to view with the aid of polarizing light microscopes for geologists. Sometimes mineral Carnotite may appear platy or in sheet form like micas and are splendid to view under polarized microscope used in optical mineralogy. Carnotite is not a fluorescent mineral. When Carnotite powder is dropped in a boiling nitric acid, it turns to red brown color and will readily dissolves for green solution. This mineral Carnotite is also an infusible specimen.

 

            Carnotite is most commonly found showing a very high surface relief when it is closely evaluated with the aid of petrographic polarizing light microscopes for mineralogists. Carnotite minerals are also found non-magnetic. Since Carnotite minerals are classified under monoclinic system of crystallization, they are usually found showing biaxial negative figures when viewed between crossed nicols of petrographic polarizing light microscopes. The maximum birefringence of mineral Carnotite is usually found ranging from 0.170 to 0.300. Carnotite has no dispersion display when evaluated in transmitted light of petrographic polarizing light microscope. The high uranium content of Carnotite makes it a radioactive mineral. Since this mineral contains uranium, hand washing is advised after handling them. Also, when breaking the mineral or even upon simple handling of the material, inhaling of the dusts should be avoided. Never ingest or lick the material. Prolonged exposure of the Carnotite mineral in the proximity of the body should be avoided. Carnotite mineral specimens should be stored away from the inhabited areas. 

 

            Carnotite is most commonly found associated with other uranium and vanadium minerals that are found in sandstones and limestones. The best field indicators of mineral Carnotite commonly include density, lack of fluorescence, crystal habits, its bright yellow color, radioactivity and its splendid association with several other wonderful minerals. Carnotite mineral is known to be of secondary origin. It has been formed by the alteration of primary uranium vanadium minerals. Mineral Carnotite is commonly found in sedimentary rocks in arid climates. Sometimes they may also occur as disseminations in sandstone and also as concentrations around petrified logs. Carnotite is also a secondary mineral, which is formed from groundwater passing through the uranium deposits. Carnotite minerals notably occur in many locations including Kazakhstan, Radium Hill in Australia, also Shaba in Zaire, Morocco and some areas in the United States such as Arizona, Wyoming, Utah, Colorado as well as Grants, New Mexico and also Mauch Chunk, Carbon Co. in Pennsylvania.



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Monday, December 29th, 2008 at 6:27 am
Category:
The Phosphates Mineral Class
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