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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The chemical formula of Goshenite is indicated by Be3Al2Si6O18 or Beryllium Aluminum Silicate. Goshenite is actually a gem variety of the mineral Beryl. Goshenite gem is actually a Silicate mineral. This gem mineral Goshenite was first found at Barrus Farm locality in Goshen, Hampshire Co., Massachusetts, USA. This Goshenite stone can be a substitute of diamond by placing a silver or green-colored metal foil behind a cut Goshenite gemstone. But this foil should be placed in a closed setting to make sure that the foil goes undetected. Goshenite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. Goshenite is actually the name applied to colorless variety of Beryl, which is also known as the mother of gemstones. There are several other interesting varieties of mineral beryl. These include the green beryl called emerald, the yellow beryl called heliodor, the pink beryl called morganite and the blue beryl called aquamarine. Some other varieties of beryl are simply referred to their color such golden beryl and red beryl. It is important to note that these color varieties of beryl are actually caused by the impurities. Pure beryl usually appears colorless. Thus, it might be really tempting to assume that gem mineral Goshenite is the purest beryl variety. But then it must be also considered that there are several elements that can act as inhibitors to color in beryl mineral. Therefore, the purity assumption of Goshenite as the purest beryl may not always be true. It has been said that the name Goshenite is on its way to extinction. But then despite of all this assumptions, Goshenite is still commonly used in the gemstone markets. Goshenite can be found to some extent in almost all beryl localities.

 

Goshenite is most commonly used for gemstone purposes and it usually exhibits nice and satisfying images when viewed under gemological microscopes. Goshenite is also considered as a source of beryllium and as an ore mineral of beryllium, Goshenite can be found exhibiting wonderful images when viewed with the aid of an ore polarizing microscope for geologists. Most crystals of Goshenite are found transparent, translucent to opaque in appearance. The toughness of the Goshenite crystals is very good but it can be also brittle at some time. Gem mineral Goshenite is most commonly found colorless in appearance even when it is evaluated under several polarizing light microscopes. Goshenite is most commonly found showing vitreous luster when gem crystals are closely viewed in reflected light of petrographic polarizing microscope used in optical mineralogy. Goshenite is usually found displaying poor cleavage in one direction when specimen is closely evaluated under polarizing microscopes for mineralogists. Goshenite can be also found showing conchoidal fracture when the gem mineral is closely viewed with the aid of polarizing microscopes for geologists. The specific gravity measure of Goshenite usually varies from 2.60 grams per cubic centimeters to 2.90 grams per cubic centimeters. The hardness measure of Goshenite when it is evaluated using the Mohs scale method is usually found ranging from 7.5 to 8.0. Goshenite is commonly found leaving a white streak when the gemstone is rubbed on a white porcelain streak plate.

 

            The mineral Goshenite is most commonly found showing an index of refraction ranging from 1.57 to 1.60 when gemstone is evaluated in plane light of petrographic polarizing microscopes. The birefringence display of the mineral Goshenite when it is evaluated between crossed nicols of geological polarizing light microscope used in optical mineralogy is commonly found ranging from 0.004 to 0.008. The pleochroism of gem mineral Goshenite is not discernable even when the mineral is viewed under polarized light microscopes. Goshenite also shows low dispersion of about 0.014 and this may actually contribute to the infrequent use of Goshenite as a desired gem, despite the excellent hardness the stone possesses as well as toughness and resistance to corrosive substance. There is no specific data found on the toxicity and health dangers for mineral Goshenite. However, the specimens of this gem mineral Goshenite should be treated with great care and use of sensible precaution is advised upon handling them.

 

            The source of Goshenite mineral crystals is the Lily Pond Mine in a pegmatite near a small lake. Other pale greenish blue, bluish green, yellowish, pink and white beryl crystals usually accompany these Goshenite crystals. Goshenite crystals are usually found worldwide but it is significantly deposited at various locations in the former USSR, Brazil, Mexico and also Canada. It can be also found in several areas in the United States including California, New Hampshire, Colorado, Connecticut, Utah, Maine, Idaho, North Carolina and South Dakota.



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Monday, March 2nd, 2009 at 2:52 am
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The Silicates Mineral Class
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Click Here For Best Selection Of High Quality Polarizing Microscope