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The chemical formula of mineral Kolwezite is indicated by (Cu,Co)2CO3(OH)2 or Copper Cobalt Carbonate Hydroxide. Kolwezite is actually a Carbonate mineral. It is also a member of the Rosasite Group of minerals. Kolwezite was only identified and first described as a mineral in 1980. And this makes it a rather young mineral in the mineral kingdom. The first mineral specimen of Kolwezite was discovered from the famous mines at Kolwezi, Shaba, Zaire. Mineral Kolwezite was actually named after this locality. From this type of locality of mineral Kolwezite, many interesting new and rare minerals have been found. Kolwezite is known to crystallize in the triclinic system of crystal formation. In optical mineralogy, this triclinic crystal system commonly comprises crystals having three axes, of which all are unequal in length and are positioned oblique to one another.

 

Mineral Kolwezite is considered as a very minor ore of copper and cobalt. It is also used as minerals specimen and it is often found exhibiting nice and interesting microscope appearance when viewed with the aid of petrographic polarizing microscopes used in optical mineralogy. Kolwezite is a rather rare mineral species. The can be noticed that mineral Kolwezite contains a significant amount of cobalt in its chemistry in place of some copper in the chemical composition of malachite. These two elements, cobalt and copper, are very strong coloring agents. And this makes mineral Kolwezite a strongly colored mineral and it unfortunately commonly appears black but still interesting when viewed under petrographic polarizing microscopes for mineralogists. Most crystals of mineral Kolwezite are found translucent in appearance. The crystal habit of the mineral Kolwezite usually include prismatic to acicular crystal sprays and crusts that are more majestically exhibited under polarized microscopes used in optical mineralogy.

 

            Kolwezite is most commonly found showing black color and sometimes it can be also found green to brown. Kolwezite is also most often found exhibiting vitreous to glassy luster when specimen is viewed in reflected light of petrographic polarizing microscope used in optical mineralogy. The specific gravity measure of the mineral Kolwezite is usually found 4.0 grams per cubic centimeters, which is considered slightly heavy. The hardness measure of mineral Kolwezite when it is evaluated using the Mohs scale method is usually 4. Kolwezite is commonly found leaving a beige streak when specimen is rubbed on a white porcelain streak plate.

 

            Kolwezite is most commonly found exhibiting moderate surface relief when it is viewed under several adjustments on the aperture diaphragm of the polarizing microscopes used in optical mineralogy. Kolwezite is usually found showing biaxial optical figure when specimen is closely evaluated between crossed nicols of petrographic polarizing microscope used in optical mineralogy. The refractive index of the mineral is commonly found ranging from 1.688 to 1.900 when it is evaluated under polarized microscope for mineralogists. The maximum birefringence that is commonly exhibited by mineral Kolwezite between crossed polars of the petrographic polarizing microscope is usually 0.212. Kolwezite also exhibits a weak birefringence when it is closely evaluated with the aid of petrographic polarizing microscopes used in optical mineralogy. There is no specific data found on the toxicity and health dangers for mineral Kolwezite. However, the specimens of the mineral species should be treated with great care and use of sensible precaution is advised upon handling them. Mineral Kolwezite is a non-radioactive species.

 

            Mineral Kolwezite is most commonly found associated with other interesting minerals like malachite, siderite, sphaerocobalitite and cobaltian calcite. The best field indicators of mineral Kolwezite usually include color, locality, hardness and density. Mineral Kolwezite has limited occurrence at its type of locality at the Kolwezi area of Shaba, Zaire.



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Monday, February 16th, 2009 at 2:49 am
Category:
The Carbonates and Borates Mineral Class
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