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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of mineral Beryllonite is indicated by NaBePO4 or Sodium Beryllium Phosphate. Beryllonite is actually a Phosphate mineral. Professor James Dwight Dana first discovered Beryllonite. It was named Beryllonite for its high beryllium content. Mineral species Beryllonite was first discovered in the year 1888 at Stoneham, Oxford Co., Maine in the United States. The first and some of the considered best Beryllonite mineral specimens have come from McKean Mountain at Stoneham, Maine. Beryllonite mineral specimen was actually first described from complex crystals and as broken fragments, which are found in the disintegrated materials of a granitic vein at Stoneham in Maine. Beryllonite is known to crystallize in the monoclinic system of crystal formation. In 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.

 

            Beryllonite is most commonly found colorless and white to pale yellow in appearance when closely evaluated in transmitted light of geological polarizing light microscopes used in optical mineralogy. Beryllonite in thin sections are usually found colorless in appearance. In optical mineralogy, colorless mineral specimens commonly allow the whole constituents of white light to pass through making the mineral non-pleochroic even between crossed nicols of polarized microscopes for mineralogists. Beryllonite specimens are usually found exhibiting vitreous luster in reflected light of petrographic polarizing microscope. Beryllonite is also usually found exhibiting good cleavage in one direction and almost fair in several other directions when specimen is viewed under several adjustments on the aperture diaphragm of the polarized microscope. Some specimens of Beryllonite can be also found showing perfect cleavage when closely evaluated with the aid of petrographic polarizing light microscopes. Beryllonite is also most commonly found exhibiting conchoidal fracture when it is evaluated closely between crossed nicols of polarizing light microscope for mineralogists. A very brittle fracture that is usually found producing small, conchoidal fragments. In optical mineralogy, fracture describes how a mineral breaks when broken contrary to its natural cleavage planes. The specific gravity measure of Beryllonite mineral specimen usually gives an approximate value of 2.8 grams per cubic centimeters, which is usually considered average for translucent minerals.The hardness measure of mineral Beryllonite when it is evaluated using the Mohs scale method is usually found from 5.5 to 6. Beryllonite is most commonly found leaving a white streak when mineral specimens are rubbed on the white porcelain streak plate.

 

            Beryllonite mineral crystals are usually found transparent to translucent in appearance most especially when frosted. The crystal habit of Beryllonite as described in the field of optical mineralogy commonly includes tabular crystals that are usually found shaped like a book when viewed under polarized light microscope used in optical mineralogy. They can be also found forming equant crystals as well as rosettes and masses that can be more splendidly exhibited when viewed with the aid of petrographic polarizing microscopes for mineralogists. Beryllonite is actually considered as a very rare beryllium mineral. It can be only found in a few types of localities around the world. Although its hardness is significant enough for it to be suitable to be cut for gemstone purposes, it also lacks fire and attractive color to become a popular gemstone. But then as a mineral specimen, it usually exhibits nice and interesting appearance when viewed with the aid of petrographic polarizing light microscope. Beryllonite is commonly used as a mineral specimen and as a gemstone for some mineral collectors.

 

            Beryllonite is most commonly found showing biaxial negative figure when specimen is closely evaluated between crossed nicols of petrographic polarizing light microscope used in optical mineralogy. Beryllonite are actually found displaying low surface relief when evaluated under several adjustments on the aperture diaphragm of petrographic polarizing microscopes. Beryllonite mineral crystals are most commonly twinned and they usually occur in several forms, which can be more clearly exhibited when specimens are viewed with the aid of petrographic polarizing microscope. Polysynthetic twinning can be also found clearly exhibited by the mineral when specimen is viewed under polarized microscopes. The refractive indices of Beryllonite commonly range from 1.552 to 1.561. Beryllonite do not make very brilliant gems but few Beryllonite crystals are actually faceted, and may be found displaying wonderful and interesting microscope images when viewed under a gemological microscope. Beryllonite crystals are commonly found exhibiting weak to distinct dispersion when viewed in transmitted light of polarizing microscope. Beryllonite fuses with difficulty to a cloudy glass. It is commonly wet on the charcoal with sulfuric acid. The powdered Beryllonite mineral commonly boils and froths. The flames produced by Beryllonite are usually yellow and succeeded later by a greenish phosphorus flame. Beryllonite minerals are neither phosphorescent nor fluorescent. These minerals are actually non-magnetic. They are also found as not radioactive minerals after several chemical evaluations. There is no specific data on the toxicity and health dangers for this Beryllonite mineral. However, mineral specimen of Beryllonite should be treated with care and use of sensible precaution is advised upon handling them.

 

            Beryllonite minerals are commonly associated with other interesting minerals such as rose quartz, feldspars, cleavelandite, elbaite, columbite, and also beryl. The best field indicators of Beryllonite minerals commonly include color, locality, crystal habit and hardness. Beryllonite minerals are actually considered as secondary beryllium minerals in granitic and alkalic pegmatites. Beryllonite minerals are commonly found forming from pegmatitic dikes. Actually, they can be easily confused with more common pegmatite minerals. Beryllonite minerals have limited occurrence at some types of localities that include the Sapucaia pegmatite in the Minas Gerais, Brazil as well as at McKean Mountain in Stoneham and Newry in Maine, USA. They can be also found at Paprok, Nuristan in Afghanistan.



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Monday, December 29th, 2008 at 6:23 am
Category:
The Phosphates Mineral Class
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