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The chemical formula of mineral Lorenzenite is indicated by Na2Ti2Si2O9 or Sodium Titanium Silicate. Lorenzenite is actually a Silicate mineral. Lorenzenite was first described in 1897 at Narsarsuk, Greenland. The rock sample was also discovered to be the same as mineral Ramsayite in 1947. Ramaysite was actually discovered in 1920s at the Kola Peninsula of Russia. Thus the mineral was actually first found on both the coast of the Kola Peninsula and of Greenland. From these coasts, many new and rare minerals have been found and still are being discovered today. The old Russian name of Lorenzenite is Ramsayite. Now the name Ramsayite is used as a synonym of the mineral Lorenzenite. The mineral species Lorenzenite was actually named in honor of Johannes Theodor Lorenzen (1855 – 1884), a Danish mineralogist and student of Greenland minerals. Lorenzenite is known to crystallize in the orthorhombic system of crystal formation. In optical mineralogy, this orthorhombic crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths.

 

Lorenzenite is most commonly used as mineral specimen and it is often found exhibiting a nice and fascinating appearance when viewed with the aid of polarizing light microscopes used in optical mineralogy. Mineral Lorenzenite is most commonly found exhibiting high luster in reflected light of the polarizing microscopes for mineralogists. This high luster of Lorenzenite is due to the titanium content of the mineral. Several other titanium minerals have high luster, especially mineral rutile that usually exhibits splendid appearance under polarizing microscopes. Most crystals of mineral Lorenzenite are found transparent to translucent in appearance. The crystal habit of Lorenzenite as described in optical mineralogy field usually includes prismatic with six sides, two of the sides are often found flattened and forming a nearly tabular crystal with a pointed termination that can be seen more clearly visible when evaluated under petrographic polarizing light microscope.

 

            Lorenzenite is most commonly found displaying brown, yellow-brown to dark brown color that can be more majestically exhibited under petrographic polarizing light microscope used in optical mineralogy. Lorenzenite is also most commonly found showing vitreous to sub metallic luster in reflected light of the petrographic polarizing microscope. The specific gravity measure of the mineral Lorenzenite usually gives an approximate value of about 3.4grams per cubic centimeters, which is considered above average for translucent minerals. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually found 6. Lorenzenite is commonly found leaving a light brown streak when the specimen of the mineral Lorenzenite is rubbed on the white porcelain streak plate.

 

            Mineral Lorenzenite is usually found showing biaxial negative figure when it is evaluated between crossed nicols of petrographic polarizing light microscopes. The refractive index of mineral Lorenzenite is usually found ranging from 1.920 to 2.020 when it is viewed under polarized light microscope for mineralogists. Lorenzenite also exhibits a very high surface relief when viewed under several adjustments on the aperture diaphragm of the polarizing microscope used in optical mineralogy. The maximum birefringence of mineral Lorenzenite when it is evaluated between crossed polars of polarized light microscope is usually 0.100. It has no dispersion display. There is no specific data found on the toxicity and health dangers for mineral Lorenzenite. However, the specimens of this mineral species should be treated with great care and use of sensible precaution is advised upon handling them. Lorenzenite is a non-radioactive mineral species.

 

            Mineral Lorenzenite can be found in alkaline magmatic and pegmatitic rocks. The best field indicators of mineral Lorenzenite usually include density, locality, color, and luster. Mineral Lorenzenite notably occurs at Kola Peninsula in Russia and Narsarsuk in Greenland. Lorenzenite can be also found in Northern Canada.



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Thursday, November 27th, 2008 at 3:46 am
Category:
The Silicates Mineral Class
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