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The chemical formula of the mineral Covellite is indicated by CuS or Copper Sulfide. Covellite is actually a Sulfide mineral. Covellite was first discovered in the year 1832 at the Mount Vesuvius in Campania, Italy. It was actually first discovered and first described by Niccola Covelli, an Italian mineralogist. Thus, the mineral was named Covellite in honor to its discover Covelli. Covellite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes.

 

            Covellite is commonly used as a mineral specimen and it is often found exhibiting a very interesting image under petrographic polarizing microscopes used in optical mineralogy. Covellite is also considered as a minor ore of copper and it can be found showing splendid microscope images when viewed with the aid of an ore polarizing light microscope for mineralogists. Covellite is not a very widely distributed mineral. It is also not well-known in the mineral world. However, it can easily captivate the admiration of anybody through its iridescent charms and interesting looks of its nice indigo blue crystals under polarized light microscopes. Good Covellite mineral crystals are extremely rare. What makes it a valuable and noteworthy mineral species is its color and nice luster when evaluated in reflected light of petrographic polarizing light microscope.

 

            Mineral Covellite is commonly found showing deep metallic indigo blue color that appears very fascinating when viewed with the aid of a polarizing microscope used in optical mineralogy. The color of Covellite may actually tarnish to purple or black. Covellite mineral crystals can be seen with iridescent yellow and red flashes when viewed closely with the aid of polarized light microscopes used in optical mineralogy. Covellite is most commonly found exhibiting metallic luster when viewed in reflected light of petrographic polarizing microscope for mineralogists. Covellite is also most commonly found forming micaceous cleavage that can be seen more clearly visible when viewed with the aid of petrographic polarizing light microscope for mineralogists. Covellite also shows perfect cleavage in one direction forming thin sheets and this can be seen more clearly visible when viewed with the aid of polarizing light microscope used in optical mineralogy. The cleavage sheets of mineral Covellite are very flexible. Covellite has a flaky structure found when it is evaluated under several adjustments on the aperture diaphragm of petrographic polarizing microscope for mineralogists. The specific gravity measure of mineral Covellite is commonly found ranging from 4.6 grams per cubic centimeters to 4.8 grams per cubic centimeters. The hardness measure of mineral Covellite when it is evaluated using the Mohs scale method is commonly ranging from 1.5 to 2. Covellite is most commonly found leaving a gray to black streak when mineral specimen of is rubbed on a white porcelain streak plate.

 

            Most Covellite crystals are found opaque to translucent in appearance. They usually appear translucent in very thin cleavage sheets. The crystal habit of mineral Covellite as described in optical mineralogy commonly includes thin platy hexagonal crystals that are dominated by the pinacoid faces usually on edges. This habit can be clearly seen more clearly exhibited when the mineral is evaluated with the aid of petrographic polarizing microscope used in optical mineralogy. Covellite can be also found in massive and in small grains in sulfide ore bodies. When the structure of mineral Covellite is evaluated, it can be noticed at it has a similar structure to that of the phyllosilicate minerals. The structure of Covellite is composed of some copper ions that are positioned at the center of the sulfur tetrahedrons, which are usually linked on their bases forming sheets. Some other copper ions are found combined with three sulfur ions in flat triangular groups, which are very similar to that of the carbonate minerals. These triangular groups are commonly found lying in a plane that can be found between the tetragonal sheets. This structure of mineral Covellite gives support or explanations to its perfect cleavage.

 

            Covellite mineral commonly shows very high surface relief when it is evaluated under several adjustments on the aperture diaphragm of polarizing microscope for mineralogists. Covellite crystals are found showing uniaxial positive figure when evaluated between crossed nicols of petrographic polarizing microscopes used in optical mineralogy. The index of refraction found when mineral Covellite is viewed in plane polarized light of petrographic polarizing light microscope is usually ranging from 1.450 to 2.620. The maximum birefringence exhibited by Covellite under polarized microscopes is usually 1.170. Covellite mineral species is strongly anisotropic. In optical mineralogy, this means that Covellite exhibits alternately dark and illuminated when evaluated between crossed nicols of petrographic polarizing light microscopes. Covellite also shows strong dispersion in transmitted light of polarizing light microscope for mineralogists. Covellite is pleochroic and commonly found exhibiting marked deep blue to white blue colors when it is viewed in plane light of polarized microscope used in optical mineralogy. Interference colors are commonly found indigo blue that are commonly highly iridescent and brass yellow to deep red. There is no specific data found on the toxicity and health danger of mineral Covellite. However, the specimens of this mineral species should be treated with great care and use of sensible precaution is advised upon handling them. Mineral Covellite is not radioactive.

 

Mineral Covellite is most commonly found associated with several interesting minerals such as pyrite, chalcopyrite, bornite, chalcocite, cuprite and many other copper sulfide minerals. The best field indicators of mineral Covellite usually includes density, color, cleavage, iridescent and crystal habit. Covellite is commonly found associated with mineral Chalcocite in zones of secondary enrichment of copper sulfide deposits. Mineral Covellite often occurs as a pseudomorphic replacement after other minerals. It rarely occurs as a volcanic sublimate at Mount Vesuvius. More commonly, Covellite mineral can be found in copper bearing veins. It notably occurs at several mineral localities such as Butte Montana, Bor Serbia, Sardinia, Germany and Australia.



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Time:
Thursday, January 29th, 2009 at 4:04 am
Category:
The Sulfides Mineral Class
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