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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of mineral Brochantite is indicated by Cu4SO4(OH)6 or Copper Sulfate Hydroxide. Brochantite is actually a Sulfate mineral. The mineral species Brochantite was first discovered in the year 1824 at the Ural Mountains in Russia. Mineral species Brochantite was named after A. J. M. Brochant de Villiers (1772-1840), a French geologist and mineralogist. Actually, it was A. Levy who named the mineral species Brochantite after him. Most serious mineral collectors consider Brochantite as a popular mineral, which commonly exhibits a fascinating microscope image under a polarized microscope used in optical mineralogy. Brochantite mineral has been considered as an important ore of copper in some places. It is usually found similar to other fibrous green copper minerals, which are formed in the oxidations zones like the halide mineral atacamite, the carbonate mineral malachite, and the closely related sulfate mineral antlerite. This similarity of Brochantite with several other minerals brings up a number of identification problems. For instance, the acicular malachite effervesces in warm hydrochloric acid while brochantite does not. Atacamite minerals are also found slightly softer and are usually less transparent when compared to Brochantite. Antlerite minerals on the other hand are all but indistinguishable to Brochantite by ordinary means. This is despite the fact that the terminations of Antlerite minerals are actually typically flatter than the rounded terminations of mineral Brochantite, which are clearly exhibited when the mineral specimen is clearly evaluated with the aid of a polarized light microscope.

 

            Brochantite mineral specimens are commonly found in shades of bright emerald green or dark green to almost black in transmitted light of petrographic polarizing microscopes used in optical mineralogy. The green color of Brochantite is commonly found in deep and attractive shade when viewed with the aid of polarizing microscope for mineralogists. They are commonly found exhibiting a vitreous luster in reflected light of petrographic polarizing microscope used in optical mineralogy. However, they may appear pearly on the cleavage surfaces. The cleavage found is commonly perfect in one direction that is nearly perpendicular to length, which is commonly clearly exhibited under a petrographic polarizing light microscope used in optical mineralogy. The fracture that is often exhibited by mineral Brochantite between crossed nicols of polarizing microscopes for mineralogists. The hardness measure of mineral Brochantite when it is evaluated using the Mohs scale method is commonly found in values that are ranging from 3.5 to 4. Brochantite mineral is usually found leaving a green streak when specimens are rubbed on a white porcelain streak plate. The specific gravity measure of mineral specimen Brochantite usually gives an approximate value of 3.9 grams per cubic centimeters, which is commonly considered above average for translucent minerals.

 

Brochantite minerals are known to crystallize in the monoclinic system of crystal formation. In the field of 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. Crystals of Brochantite are usually found transparent to translucent in appearance. Brochantite minerals are commonly found forming acicular or fibrous crystals, which are aggregated into randomly organized coatings and tufts that are splendidly exhibited under polarized microscopes used in optical mineralogy. They can be also found as small tabular crystals and reniform as well as massive or granular specimens that are usually displaying magnificent microscope views when evaluated with the aid of polarizing microscope for mineralogists. Crystals of Brochantite mineral are commonly terminated. The terminations found tend to be dome-like or rounded, which are interesting to view under petrographic polarizing microscopes used in optical mineralogy. Brochantite crystals are commonly twinned and the twinning that is formed usually gives an orthorhombic look to larger crystals. Some Brochantite crystals are also found in acicular crystals that are usually needle-like in form. They are also found growing in cavity that usually results in numerous crystal tipped surfaces, which are usually exhibiting splendid images under a petrographic polarizing microscopes for mineralogists.

 

Mineral specimen Brochantite is actually found as a biaxial negative figure between crossed nicols of petrographic polarizing light microscope used in the field of optical mineralogists. The indices of refraction found as displayed by Brochantite minerals are usually ranging from 1.728 to 1.800. When Brochantite mineral specimen is evaluated between crossed nicol of polarizing microscope for mineralogists, it commonly exhibits a very high surface relief. It commonly displays a relatively weak dispersion in transmitted light of polarized microscopes. Brochantite minerals do not effervesce in hydrochloric acid solution. Brochantite is also considered as a minor ore of copper. It is also used as a mineral specimen. There is no specific data on the toxicity and health dangers for Brochantite minerals. However, specimens of Brochantite should be treated with great care and use of sensible precaution is advised upon handling them because Brochantite mineral specimens are commonly fragile. More often, Brochantite minerals are made in the lab on a host rock and are usually counterfeited. They are commonly associated with several other interesting minerals such as cuprite, azurite, limonite, cyanotrichite, chrysocolla, malachite, posnjakite and langite. Brochantite minerals are commonly formed from the oxidation of copper ore minerals. They are actually found along with several other oxidation zone minerals. Brochantite minerals are also considered as alteration product in hydrothermal replacement deposits. Brochantite minerals are commonly formed from the oxidation of copper ore minerals along with other oxidation zone minerals. They are commonly formed in arid climates. They can be actually found more often in rapidly oxidizing copper sulfide deposits. The best field indicators of Brochantite usually include color, crystal habit, hardness, cleavage, and its non-reaction to hydrochloric acid as well as its splendid association with other interesting minerals. Brochantite minerals notably occur at some types of localities including numerous location in Russia, Chile, Romania, England, Zaire, Italy as well as several other locations in the United States like Nevada, Arizona, New Mexico, Utah and California.



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Friday, January 15th, 2010 at 4:52 am
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The Sulfates Mineral Class
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