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The chemical formula of mineral Neptunite is indicated by KNa2Li(Fe,Mn)2Ti2Si8O24 or Potassium Sodium Lithium Iron Manganese Titanium Silicate. Neptunite is actually a Silicate mineral. It is most commonly used as mineral specimen and it is most often found exhibiting nice and interesting images when viewed with the aid of polarized light microscope used in the field of optical mineralogy. Mineral Neptunite was discovered in early 1900’s and is of rare occurrence. The most famous Neptunite specimen comes from the wonderful deposits at San Benito County in California. This site contains Natrolite veins in a serpentinite rock. Black prismatic crystals of mineral Natrolite is most often found embedded in the pure white natrolite together with the sapphire blue benitoite. This assemblage is considered classic among collectors and specimens with all three minerals that are much sought after. Mineral Neptunite is actually named after the Roman God of the sea, Neptune. Neptunite crystals are well formed and typically show multiple secondary faces when viewed under polarizing light microscopes for mineralogists. He flashes of red that appear to come right from the center of the crystal are a nice added touch to this rare and interesting mineral.

 

            Mineral Neptunite is most commonly found black to reddish black in color when viewed with the aid of polarizing light microscope used in the field of optical mineralogy. Neptunite is also most commonly found exhibiting a vitreous luster when viewed in reflected light of polarized microscope for mineralogists. Most Neptunite crystals are found translucent to opaque in appearance. Mineral Neptunite is known to crystallize in the monoclinic system of crystals formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis. The crystal habit of mineral Neptunite as described in the field of optical mineralogy usually includes prismatic, elongated crystals with nearly square cross-sections. The terminations are modified and slanted dome faces. Neptunite can be also found massive and in disseminated grains.

 

Mineral Neptunite is most commonly found showing a perfect cleavage in two directions at about 80 degree to 100 degree angle. Neptunite is also usually found exhibiting a splintery fracture when viewed with the aid of polarized light microscope used in the field of optical mineralogy. The hardness measure of the mineral Neptunite when it is evaluated using the Mohs scale method is usually 5.5. Neptunite mineral specimen is most commonly found leaving a reddish brown streak when it is rubbed on a white porcelain streak plate. Neptunite is usually found showing internal red reflection and can sometimes be seen through the prismatic crystal faces when viewed with the aid of polarizing microscope used in the field of optical mineralogy. Mineral Neptunite is most commonly found associated with other interesting minerals such as benitoite, natrolite, joaquinite, aegerine, and serpentine. The best field indicators of mineral Neptunite include internal reflection, streak, crystal habit, color, association, and cleavage. Mineral Neptunite notably occurs at its type of locality at San Benito Co., California as well as Narsarsuk, Greenland and Kola Peninsula, Russia.



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Friday, May 15th, 2009 at 3:19 am
Category:
The Silicates Mineral Class
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