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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 Taaffeite is indicated by BeMgAl4O8 or Beryllium Magnesium Aluminum Oxide. Taaffeite actually belongs to the Oxides and Hydroxides mineral class. Taaffeite is most commonly used or cut for gemstone purposes and it is most often found exhibiting fascinating brilliance when viewed with aid of gemological microscopes most especially polarized microscopes. Taaffeite is actually a very rare gem mineral that is usually found exhibiting beautiful and splendid images when viewed with the aid of petrographic polarizing light microscopes used in the field of optical mineralogy. Taaffeite was named after Count Taaffe, who first discovered the mineral. It is actually one of those odd minerals that were first discovered from already cut and misidentified gemstone specimens. The gems are first thought to be mauve spinel. Taaffeite is actually very similar to Spinel in every aspect except for the double refracting property of Taaffeite. The double refraction of Taaffeite is the only key and the only way that the gem quality Taaffeite can be distinguished among other gemmy grains found in the alluvial deposits in Sri Lanka. There were also lower grade Taaffeite specimens found in China and it is usually associated with fluorite.

 

            Taaffeite is most commonly found mauve or pink in color, also violet which can be seen more fascinating and very splendidly exhibited when viewed with the aid of petrographic polarizing light microscopes used in the field of optical mineralogy. Taaffeite is also usually found showing vitreous to adamantine luster when viewed in reflected light of polarized microscope for mineralogists. Most crystals of mineral Taaffeite are found transparent to translucent in appearance. Taaffeite is also 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. The crystal habit of mineral Taaffeite is very limited to alluvial grains but can still be found very interesting when evaluated with the aid of polarized microscopes for mineralogists.

 

            Taaffeite has absent cleavage even when it is evaluated closely with the aid of polarized microscopes for mineralogists. The hardness measure of mineral Taaffeite when specimen is evaluated using the Mohs scale method is usually 8 to 8.5. The specific gravity measure of the mineral is usually found 3.6+ grams per cubic centimeters, which is considered above average for translucent minerals. Taaffeite is also most commonly found leaving a white streak when specimen is rubbed on a white porcelain streak plate. Taaffeite is most commonly associated with other alluvial gemstones such as spinel and also fluorite. Taaffeite is found to weakly pleochroic when viewed in polarized microscopes used in the field of optical mineralogy. it actually shows different color shades found different viewing angles using the polarizewd microscope. The index of refraction of Taaffeite is around 1.72. The best field indicators of mineral Taaffeite usually include double refraction, color, hardness and locality. Taaffeite notably occurs at several areas including alluvial deposits in Sri Lanka and sediments in China.

 



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Thursday, August 13th, 2009 at 2:12 pm
Category:
The Oxides and Hydroxides Mineral Class
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