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The chemical formula of mineral Murmanite is indicated by Na2(Ti,Nb)2Si2O9 – n(H2O) or Hydrated Sodium Titanium Niobium Silicate. Murmanite is actually a Silicate mineral. Mineral Murmanite is only one of those rare species that can be found on the Kola Peninsula, Russia. This locality is considered classic and is very well known around the world for its capacity to produce some truly one-of-a-kind mineral specimens. Mineral Murmanite is actually of no exception from the list. The first specimen of the mineral was discovered in 1923 at its type of locality at Murmansk, Kola Peninsula in Russia. The mineral was named after its type of locality. Murmanite is known to crystallize in the triclinic system of crystal formation. In optical mineralogy, this triclinic crystal system commonly comprises crystals having three axes, of which all are unequal in length and are positioned oblique to one another.

 

Murmanite is most commonly used as mineral specimen and it usually exhibits interesting appearance when viewed with the aid of petrographic polarizing light microscope used in optical mineralogy. Looking at the formula of mineral Murmanite alone, one can readily conclude that it is a truly unique mineral species. Its components namely niobium and titanium are not commonly found in the earth’s crust. The pink color that is commonly exhibited by the mineral is very attractive and unique and is usually majestically exhibited under polarized microscopes. The luster that is commonly exhibited by the mineral in reflected light of the petrographic polarizing microscope is wonderful but usually difficult to describe. Murmanite is actually a good mineral to add to the collections of those who are interested in rare species of minerals.

 

            Murmanite is most commonly found exhibiting pink to purple color that is usually splendidly wonderful and attractive when viewed with the aid of polarized microscopes for mineralogists. Murmanite is also usually found displaying vitreous to pearly luster in reflected light of polarizing microscopes for geologists. Murmanite also exhibits perfect cleavage in one direction forming thin sheets and this is usually clearly visible when evaluated under petrographic polarizing microscope used in optical mineralogy. Murmanite is also most commonly found showing flaky fracture when viewed under polarizing microscope for geologists. The specific gravity measure of the mineral Murmanite usually gives an approximate value of about 2.75 grams per cubic centimeters. The hardness measure of mineral Murmanite when it is evaluated using the Mohs scale method is usually ranging from 2 to 3. Murmanite is most commonly found leaving a pale pink streak when specimen is rubbed on a white porcelain streak plate.

 

            Most Murmanite crystals are found transparent to translucent in appearance. The crystal habit of mineral Murmanite as described in optical mineralogy usually includes tabular crystals that can be majestically exhibited under polarizing microscope for geologists. Murmanite can be also found massive in form, lamellar and granular. The cleavage sheets of mineral Murmanite are found elastic. Murmanite commonly displays high surface relief when evaluated under several adjustments on the aperture diaphragm of the petrographic polarizing light microscopes. Murmanite is commonly shows biaxial negative figure when viewed between crossed nicols of the petrographic polarizing microscopes. The refractive index of Murmanite is usually found ranging from 1.692 to 1.839 when it is evaluated under polarizing microscopes. Murmanite also exhibits a weak dispersion when viewed under polarized microscopes. The maximum birefringence of the mineral is found to be 0.125 when it is examined under petrographic polarizing light microscopes. There is no specific data found on the toxicity and health dangers for mineral Murmanite. However, the specimens of this mineral species should be treated with great care and use of sensible precaution is advised upon handling them. Mineral Murmanite is a non-radioactive mineral species.

 

            Murmanite is commonly found associated with other interesting minerals including nepheline, feldspars, epistolite and other rare titanium and niobium minerals. The best field indicators of mineral Murmanite usually include color, crystal habit, associations, and locality. Murmanite commonly forms as supergene alteration product of lomonsovite. The mineral notably occurs at its type of locality at Murmansk, Kola Peninsula in Russia.



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Thursday, November 27th, 2008 at 3:48 am
Category:
The Silicates Mineral Class
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