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The chemical formula of the mineral Cornetite is indicated by Cu3PO4(OH)3 or Copper Phosphate Hydroxide. Cornetite is actually a Phosphate mineral. Mineral Cornetite was named after Jules Cornet, Belgian geologists. Cornetite was discovered in the year 1916 at Shaba, Congo. Mineral Cornetite is known to crystallize in the orthorhombic system. In optical mineralogy, this crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths. Mineral Cornetite is commonly used as a mineral specimen and it is commonly found exhibiting a nice and interesting microscope images under petrographic polarizing light microscopes for mineralogists. Cornetite is also considered rare type of secondary copper mineral. This mineral species is also noted for its very interesting color, which comes in shades of green and blue. Mineral Cornetite has been regarded very popular piece of mineral collection because of its good and interesting deep color, attractive sparkle and its nice formation of crystals.

 

            Cornetite minerals are usually found dark blue, green blue or sometimes green in color, which can be very fascinating when viewed with the aid of petrographic polarizing microscopes. Cornetite is most commonly found exhibiting a vitreous luster in reflected light of polarizing microscope used in optical mineralogy. Mineral Cornetite is most commonly found with absent cleavage even when it is closely evaluated under several adjustments on the aperture diaphragm of the polarizing light microscopes for mineralogists. Cornetite also exhibits uneven fracture when it is examined with several stage rotations in plane light of polarizing light microscope. The specific gravity measure of the mineral usually gives an approximate value of 4.1 grams per cubic centimeters, which is commonly considered average for translucent minerals. The hardness measure of the mineral Cornetite when it is evaluated using the Mohs scale method is commonly 4.5. When mineral specimen Cornetite is rubbed on a white porcelain streak plate, it can be found leaving a blue streak.

 

            Most Cornetite mineral crystals are translucent in appearance. The crystal habits of the mineral Cornetite commonly include crystals, which are short, rounded and nearly diamond shaped prisms that are found terminated by a dome having trapezoidal faces as described in optical mineralogy. This habit can be exhibited clearly when evaluated with the aid of petrographic polarizing microscopes. Cornetite can be also found as tiny crystalline druses, crusts or maybe fibrous masses that are usually fascinating when viewed under polarizing light microscopes for geologists. Cornetite exhibits a very high surface relief when viewed with the aid of petrographic polarizing microscope.

 

Cornetite mineral crystals are also considered brittle. In optical mineralogy, this is a property that is generally displayed by glasses and most nonmetallic minerals. This mineral species Cornetite is commonly found having a biaxial negative figure when evaluated between crossed nicols of polarizing light microscope used in optical mineralogy. Cornetite mineral displays no dispersion. The maximum birefringence exhibited by mineral Cornetite in plane light of polarized light microscopes is commonly 0.0550. When the mineral Cornetite is evaluated in plane polarized light, the refractive indices of mineral Cornetite that is found is commonly ranging from 1.765 to 1.820. This mineral Cornetite is actually not radioactive. There is no specific data found on the toxicity and health danger for mineral Cornetite. However, the specimens of this mineral should be treated with great care and use of sensible precaution is advised upon handling them.

 

            Mineral Cornetite is commonly associated with malachite, limonite, pseudomalachite, libethenite, brochantite and several other secondary copper ore minerals that display nice images under an ore polarizing light microscopes. The best field indicators of mineral Cornetite commonly include color, streak, density, crystal habit and its amazing association with many other interesting minerals. Mineral Cornetite can be found in highly weathered, oxidation zones of copper sulfide mineral ore bodies. Mineral Cornetite notably occurs at some famous mineral localities like Shaba, Congo, the Empire Nevada Mine, Yerington, Nevada in the United States and also Bwana Mkubwa in Zambia.



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Thursday, August 28th, 2008 at 3:21 am
Category:
The Phosphates Mineral Class
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