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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. Beryllonite is a very rare beryllium mineral. Beryllonite is commonly used as a mineral specimen and as a gemstone for some mineral collectors. As a mineral specimen, it is most commonly found exhibiting nice and interesting microscope appearance when evaluated with the aid of petrographic polarizing microscopes used in the field of optical mineralogy. 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. Beryllonite was first discovered by Professor James Dwight Dana. It was named Beryllonite for its high beryllium content. Mineral 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 specimens are usually found colorless and white to pale yellow when viewed in transmitted light of polarizing microscope used in optical mineralogy. Beryllonite usually appear colorless in thin sections. In the field of optical mineralogy, it has been found that colorless mineral specimens commonly allow the whole constituents of white light to pass through making the mineral non-pleochroic even between crossed nicols of polarizing microscopes for mineralogists. Beryllonite minerals are usually found exhibiting a vitreous luster when specimen is viewed in reflected light of petrographic polarizing microscope used in the field of optical mineralogy. Beryllonite is most commonly found showing good cleavage in one direction and almost fair in several other directions when specimen is closely evaluated with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. Some specimens of Beryllonite may be also found having perfect cleavage when evaluated under polarized microscopes for mineralogists. Beryllonite is also found showing conchoidal fracture when closely evaluated under polarizing light microscope used in the field of optical mineralogy. It is usually a very brittle fracture that is usually found producing small, conchoidal fragments. In the field of optical mineralogy, fracture describes how a mineral breaks when broken contrary to its natural cleavage planes. The hardness measure of mineral Beryllonite when it is evaluated using the Mohs scale method is usually found in a range of 5.5 to 6. Beryllonite is most commonly found leaving a white streak when mineral specimens are rubbed on the white porcelain streak plate. 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.

 

            Beryllonite mineral is 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. Beryllonite mineral specimen crystals are usually found transparent to translucent in appearance, especially when frosted. The crystal habit of Beryllonite as described in the field of optical mineralogy commonly includes tabular crystals, which are usually found shaped like a book when viewed under polarized light microscope for mineralogists. They can be also found as equant crystals as well as rosettes and masses, which are commonly splendidly exhibited when viewed with the aid of polarizing microscopes. Beryllonite minerals are commonly associated with other interesting minerals such as rose quartz, feldspars, cleavelandite, elbaite, columbite, and also beryl.

 

            Beryllonite mineral crystals are commonly found twinned and they usually occur in several forms, which can be seen more clearly visible when viewed with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. Polysynthetic twinning can be also found clearly visible when the mineral specimen is viewed under geological polarizing microscopes. The refractive indices found when Beryllonite mineral is evaluated in plane-polarized light of polarizing microscope are commonly ranging from 1.552 to 1.561. They 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 minerals are commonly found showing biaxial negative figure when evaluated closely between crossed nicols of polarizing microscopes for mineralogists. Beryllonite are actually found displaying a low surface relief when it is evaluated under several adjustments on the aperture diaphragm of petrographic polarizing microscopes used in the field of optical mineralogy. They are commonly found exhibiting a weak to distinct dispersion when viewed in transmitted light of polarizing microscope for mineralogists. 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 actually considered as secondary beryllium minerals in granitic and alkalic pegmatites. The best field indicators of Beryllonite minerals commonly include color, locality, crystal habit and hardness. 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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Tuesday, December 15th, 2009 at 2:51 pm
Category:
The Phosphates Mineral Class
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