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The chemical formula of mineral Nahcolite is indicated by NaHCO3 or Sodium Bicarbonate. This Nahcolite is actually a Carbonate mineral. Nahcolite is only used as mineral specimen and it can be seen exhibiting nice and interesting microscope appearance when viewed with the aid of polarizing light microscope used in the field of optical mineralogy. Nahcolite is only one of the few minerals named after their chemistry. From its formula NaHCO3, simply replace the 3 with lite and you’ll get nahcolite. Mineral Nahcolite commonly forms large concretionary masses in the oil-shales of the Green River Formation and as an evaporite mineral in non-marine sedimentary deposits. Nahcolite was actually first discovery as a mineral at Searles Lake, California in the yeaar1940 and forms several beds in the lake sediments, some up to two feet thick. Nahcolite can absorb water and specimens should be stored in closed containers.

 

            Mineral Nahcolite is also most commonly colorless, white, brown or gray, which can be seen more clearly exhibited when specimen is viewed with the aid of polarizing light microscope used n the field of optical mineralogy. Nahcolite is also most commonly found exhibiting a vitreous luster when viewed in reflected light of polarizing microscopes for mineralogists. Most crystals of mineral Nahcolite are found transparent to translucent in appearance. Mineral Nahcolite is known to crystallize in the monoclinic system of crystal 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 Nahcolite as described in the field of optical mineralogy includes prismatic crystals, but usually massive crusts all of which can be seen more clearly visible when viewed with the aid of petrographic polarizing light microscopes for mineralogists.

 

            Mineral Nahcolite is also most commonly found exhibiting a perfect cleavage when viewed with the aid of polarized light microscopes. The hardness measure of mineral Nahcolite when it is evaluated using the Mohs scale method is usually 2.5. Nahcolite is most commonly found leaving a white streak when rubbed on white porcelain streak plate. The specific gravity measure of mineral Nahcolite is usually 2.2 grams per cubic centimeters, which is considered well below average. The best field indicators of mineral Nahcolite includes environment of formation, cleavage, density, crystal habit, and locality. Nahcolite is usually found associated with other minerals including hanksite, borax, calcite, halite, analcime, gaylussite, pirssonite, and northupite. Mineral Nahcopite notably occurs at several localities including Searles Lake, San Bernardino County and Deep Spring Lake, Inyo County, California and Green River Formation, Colorado, USA as well as Egypt and Lake Megadi, Kenya.



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Friday, May 15th, 2009 at 3:14 am
Category:
The Carbonates and Borates Mineral Class
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