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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

Morganite is actually the pink variety of Beryl. The chemical formula of the mineral Morganite is indicated by Be3Al2Si6O18 or Beryllium Aluminum Silicate. Morganite is actually a Silicate mineral. Morganite was first discovered together with other gemstone minerals, such as Tourmaline and Kunzite, in California in the early twentieth century at Pala. Morganite was named after J. P. Morgan, a famous American industrialist. It was George Frederick Kunz who suggested naming the pink variety of Beryl as Morganite in 1911, after his biggest customer J. P. Morgan. Morganite is known to crystallize in the hexagonal system, which can be seen clearly exhibited under geological polarizing light microscopes. 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. Some beryl is usually found crystallizing in well formed hexagonal prisms with pedion terminations.

 

            Morganite is most commonly used for gemstone purposes and it is often found exhibiting nice and fascinating appearance under gemological microscope. Morganite is actually colored by trace amounts of manganese that find their way into the crystal structure. Pink is one of the most desirable colors of beryl. Morganite is quite rare and expensive. Morganite turns pinker when subject to increasing temperature treatment. Color banding is also found common in Morganite. Morganite gem is commonly found in various shades of pink that is often splendidly exhibited under polarizing light microscopes. Morganite is quite hard. The hardness measure of the Morganite when it is evaluated using the Mohs scale method is usually ranging from 7.5 to 8. Morganite usually exhibited a poor cleavage in only one direction when it is viewed with the aid of the petrographic polarizing light microscope. The specific gravity measure of Morganite is usually found ranging from 2.65 grams per cubic centimeters to 2.85 grams per cubic centimeters.

 

            Morganite also shows birefringence ranging from 0.004 to 0.008 when evaluated under polarized microscope. Morganite is usually found weakly pleochroic when viewed under polarized light microscopes. Morganite is most commonly found displaying a uniaxial negative figure when it is evaluated between crossed nicols of polarizing microscopes used in optical mineralogy. The index of refraction of the Morganite gem is most commonly found ranging from 1.57 to 1.60. Morganite is most commonly found showing a weak dichroism when examined under polarized microscopes for mineralogists.        Morganite notably occurs at several localities including Brazil, Madagascar, and some areas in the United States such as California, Maine, Connecticut, and North Carolina.



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Monday, September 29th, 2008 at 2:43 am
Category:
The Silicates Mineral Class
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