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The chemical formula of mineral Brazilianite is indicated by NaAl3(PO4)2(OH)4 or Sodium Aluminum Phosphate Hydroxide. Brazilianite actually belongs to the Phosphates mineral class. Brazilianite mineral species was actually first discovered in the Conselheiro Pena in the Minas Gerais, Brazil in the year 1945. It was actually named after its locality of discovery. Later that time, Brazilianite minerals were also discovered at the Palermo Mine in the New Hampshire.      Brazilianite is also considered as an unusual gemstone mineral, which commonly shows fascinating appearance under a gemological microscope. Brazilianite is only one of those phosphate minerals that are used as a serious gemstone. But despite this precious image of Brazilianite, it is still not well known to everybody since it is relatively new in the mineral market. Brazilianite mineral specimens are actually found exhibiting a nice fair luster in reflected light of polarizing microscope for mineralogists. It also shows an interesting color of yellow to greenish yellow when it is viewed in transmitted light of petrographic polarizing microscope used in the field of optical mineralogy. Brazilianite minerals may look like a yellow topaz but it is usually found to be greener. Even though Brazilianite is not as hard as most other gemstones, it is also considered as one of the hardest phosphate minerals found.

 

            Brazilianite minerals are commonly found in shades of yellow to greenish yellow in transmitted light of petrographic polarizing microscope used in optical mineralogy. They may be also found colorless in appearance and this colorless section of this minerals actually allow the whole constituent of the white light to pass through making the mineral non-pleochroic even between crossed nicols of polarizing microscope for mineralogists. Brazilianite minerals are usually found exhibiting vitreous luster in reflected light polarizing microscopes. When Brazilianite mineral specimen is evaluated between crossed nicols of petrographic polarizing microscopes, it commonly found showing a perfect cleavage in one direction. The fracture found is commonly conchoidal when it is examined under several adjustments on the aperture diaphragm of the polarized microscopes used in the field of optical mineralogy. Conchoidal fracture is developed in brittle materials that are characterized by smoothly curving surfaces. The hardness measure for Brazilianite mineral specimen when it is evaluated using the Mohs scale method is commonly found 5.5. Brazilianite is usually found leaving a white streak specimen is rubbed on a white porcelain streak plate. The specific gravity measure of Brazilianite mineral specimen commonly gives an approximate value of 3 grams per cubic centimeters, which is considered average for translucent minerals.

 

            Brazilianite 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. Brazilianite crystals are commonly found transparent to translucent in appearance. The crystal habit of Brazilianite as described in the field of optical mineralogy commonly includes complex short prismatic and wedge shaped crystals, which are interesting and usually display a fascinating microscope images under a petrographic polarizing light microscopes used in the field of optical mineralogy. It can be also clearly found with the aid of this polarizing microscope for mineralogists that these crystals seem to lack any symmetry. Massive crystal formation of Brazilianite mineral is very much unknown. But of course, Brazilianite mineral crystals are quite common. Some Brazilianite crystals are found having well defined faces and with sharp terminations when viewed under polarizing microscopes for geologists. They can be also found as euhedral crystals that occur as well formed crystals commonly showing good external form. Sometimes they are also found as spherical aggregates. Brazilianite minerals are commonly associated with several other fantastic and fascinating minerals such as muscovite, quartz, feldspars and also the secondary and primary phosphates that are usually associated with phosphate rich pegmatites.

 

            Mineral Brazilianite is commonly found showing biaxial positive figure when viewed with the aid of petrographic polarizing microscope used in optical mineralogy. It has a marked dispersion in transmitted light of polarized light microscopes for mineralogists. When its specimens are evaluated under a petrographic polarizing light microscope used in optical mineralogy, they are commonly found showing a moderate surface relief. Brazilianite crystals are commonly found striated when its specimens are evaluated with the aid of polarized microscopes. The index of refraction is found ranging from 1.60 to 1.62. Because of the nice color and brightness exhibited by the mineral Brazilianite, it is considered suitable to be cut for gemology purposes. It actually a sought after precious stone that is commonly ground into facet cuts, which are really wonderful when viewed under gemological microscopes. Brazilianite crystals are also found brittle, a property that is often displayed by glasses and most non-metallic minerals. This Brazilianite mineral is also a non-fluorescent mineral. The birefringence found is 0.021. There is no specific data on the toxicity and health dangers for mineral Brazilianite. However, mineral specimens of this mineral should be treated with great care and use of sensible precaution is advised upon handling them.   Brazilianite minerals are commonly found in the phosphate rich pegmatites. But there can be also unusual occurrence of Brazilianite in some igneous pegmatites. They can also actually form as hydrothermal minerals in the potassium rich zones of granitic pegmatites. The best field indicators of Brazilianite mineral usually include color, low density, crystal habit and cleavage. Brazilianite minerals notably occur at some types of localities such as Conselheiro Pena and some other famous mining areas in Minas Gerais, Brazil as well as the Smith Mine, Newport in the New Hampshire.



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Friday, January 15th, 2010 at 4:51 am
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The Phosphates Mineral Class
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