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The chemical formula of mineral Julienite is indicated by Na2Co(SCN)4•8(H2O). Julienite is usually found occurring at Cobaltian wad in a white talc schist. This mineral is also most commonly found from its type of locality at Chamitumba, near Kambove, Shaba, Zaire. Julienite was named for Henri Julien (-1920), Belgian scientist. Julienite is also known to crystallize in the tetragonal system of crystal formation. In optical mineralogy, this tetragonal system comprises crystals having three axes, which are all in a position perpendicular to one another. Two axes are usually found having the same or equal length. Mineral Julienite is known to have good cleavage in one direction which can be more clearly exhibited when evaluated with the aid of petrographic polarizing microscope for mineralogists. Mineral Julienite is also found colored blue in hand sample. The density measure of mineral Julienite is also commonly found 1.648 grams per cubic centimeters. The crystal habit of mineral Julienite as described in the field of optical mineralogy usually includes encrustations forming crust-like aggregates on matrix. It is also found with uniaxial positive figure and 0.0890 birefringence when specimen is evaluated between crossed nicols of polarizing microscope. Mineral Julienite is also found not radioactive after chemically evaluated.



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Thursday, December 29th, 2011 at 8:55 am
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Optical Mineralogy
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