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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 mineral Edingtonite is indicated by BaAl2Si3O10 – 4H2O or Hydrated Barium Aluminum Silicate. Edingtonite is actually a Silicate mineral. Edingtonite was named after the Scottish mineral collector James Edington (1787 – 1844). The first mineral specimen of Edingtonite mineral was found at Kilpatrick Hills in Scotland. Mineral Edingtonite is known to crystallize in the tetragonal and orthorhombic system at some occasions. In optical mineralogy, this orthorhombic crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths. The tetragonal system, on the other hand, comprises crystals having three axes, which are all in a position perpendicular to one another. Two axes are usually found having the same or equal length. This is the reason why Edenite is considered as an unusual mineral for it has two polytypes or two phases. One type of mineral Edingtonite contains a little more water and has an orthorhombic symmetry that can be found clearly exhibited with the aid of polarized light microscopes. The other type of mineral Edingtonite has a tetragonal symmetry. But both types of mineral have an overall tetragonal look in its crystal formation.

 

Mineral Edingtonite is most commonly used as mineral specimen and it usually exhibits nice and interesting microscope appearance when closely evaluated with the aid of petrographic polarizing light microscopes for mineralogists. Edingtonite is also one of the Zeolite minerals known in the mineral world. And like any other Zeolite mineral. Edingtonite can be also found formed in the cavities of the volcanic rocks. Edingtonite mineral is commonly found forming nice and well-shaped crystals even though it does not show colorful minerals. And the structure of mineral Edingtonite is very typical of zeolites. The openness property that commonly allows large molecules and ions to reside and move around inside the overall framework is possessed by Edingtonite. It contains the open channels that commonly allow large ions and water molecules to travel in and out of the structure. The size of molecules and ions are controlled by the size of the open channels. And because of these, Zeolites like Edingtonite can actually act as a chemical sieve that would allow some ions to pass through while blocking others.

 

            Edingtonite is most commonly found showing colorless or white appearance under polarizing light microscopes used in optical mineralogy. Edingtonite is most commonly found exhibiting a vitreous to dull luster when viewed in reflected light of polarized light microscope. Edingtonite can be also found exhibiting a perfect cleavage in one direction lengthwise and this can be seen more clearly visible when viewed with the aid of the polarizing microscopes for mineralogists most especially the ones used in the field of optical mineralogy. It is also most commonly found showing uneven fracture when closely evaluated under several adjustments on the aperture diaphragm of the polarizing microscopes for mineralogists. The specific gravity measure of mineral Edingtonite usually gives an approximate value of 2.8 grams per cubic centimeters, which is considered average although heavy for zeolite. The hardness measure of the mineral Edingtonite when it is evaluated using the Mohs scale method is usually 4. It is also usually found leaving a white streak when rubbed on a white porcelain streak plate.

 

            Most Edingtonite mineral crystals are can be found transparent but most commonly translucent in appearance. The crystal habit of the mineral Edingtonite as described in optical mineralogy commonly include blocky to prismatic or bladed crystals usually with a square cross section that can be seen more clearly visible when evaluated with the aid of petrographic polarizing light microscope. Edingtonite minerals can be also found massive in form. Mineral Edingtonite displays a low surface relief when it is closely examined with several minor adjustments on the aperture diaphragm of the polarizing microscopes for mineralogists. When Edingtonite is closely evaluated between crossed nicols of petrographic polarizing light microscopes, it is most often commonly found showing a biaxial negative figure. It also exhibits a moderate dispersion in plane light of polarized microscopes. The maximum birefringence of the mineral Edingtonite when it is evaluated with the aid of polarized microscope is 0.016. The refractive indices found when the mineral is viewed in plane-polarized light of polarizing microscope used in optical mineralogy usually ranges from 1.538 to 1.554. There is no specific data on the toxicity and health dangers for mineral Edingtonite. However, the specimens of this mineral should be treated with great care and use of sensible precaution is advised upon handling them. This mineral is not radioactive.

 

Edingtonite is commonly associated with several other interesting minerals such as heulandite, stilbite, manganite, natrolite and other zeolites. The best field indicators of mineral Edingtonite usually include density, crystal habit and its wonderful association with other minerals. Edingtonite notably occurs at some types of localities including Old Kilpatrick in Scotland, the Ice River in Canada and also in Bohlet, Sweden.



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Monday, September 29th, 2008 at 2:42 am
Category:
The Silicates Mineral Class
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