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The chemical formula of mineral Sal Ammoniac is indicated by NH4Cl or Ammonium Chloride. Sal Ammoniac is actually a Halide mineral. It is most commonly used as mineral specimen. Sal Ammoniac is said to be an oddball mineral. Having ammonium in its chemical composition is said to be odd enough property of Sal Ammoniac. Sa Ammoniac is actually one of the most common and most well-known ammonium-bearing minerals. Sal Ammoniac is known to be very soluble in water and its crystals will be removed during the first rain of their existence, only if they are not removed first by mineral collectors. Natural crystals of Sal Ammoniac have an unreal or unnatural character. This is so because they are so small, delicate, intricate and at times quite beautiful that they just do not seem to be like other minerals.

 

            Sal Ammoniac is most commonly found colorless, white or off-white almost yellow in color that could appear more interesting when viewed with the aid of petrographic polarizing light microscopes. Sal Ammoniac is also commonly found showing vitreous luster when viewed in reflected light of petrographic polarizing light microscope. Most crystals of Sal Ammoniac are found transparent to translucent in appearance. The crystal habits of Sal Ammoniac as described in the field of optical mineralogy usually include cubes, octahedrons and dodecahedrons. It can be also found forming complicated arborescent, snowflake-like and dendritic specimens that can be more fascinating and more interesting when closely evaluated using the polarized microscope used in optical mineralogy.

 

            Sal Ammoniac is known to crystallize in the isometric system of crystal formation. In optical mineralogy, this isometric crystal system comprises crystals having three axes, all of which are perpendicular to one another and all are found equal in lengths. Sal Ammoniac is also usually found showing poor cleavage in one direction that can be seen more clearly visible when viewed with the aid of petrographic polarizing light microscopes for mineralogists. It is also found showing conchoidal to earthy fracture when viewed under polarizing microscope. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually 1.5 to 2. Sal Ammoniac is also commonly found leaving a white streak when specimen is rubbed on a white porcelain streak plate. The specific gravity measure of the mineral Sal Ammoniac is usually 1.5 grams per cubic centimeters, which is considered light. Sal Ammoniac is usually found associated with other interesting minerals including sodium, alum, sulfur and other fumaroles minerals. The best field indicators of mineral Sal Ammoniac usually include density, softness, crystal habit, origin of formation and associations. Sal Ammoniac is known to form on volcanic rocks near fume releasing vents. Another possible natural occurrence exists from underground burning coal seams. Sal Ammoniac can be also produced artificially. It is usually used in photography. Mineral Sal Ammoniac notably occurs at several localities including Tadzhikistan, Italy and Mexico.

 



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Thursday, July 30th, 2009 at 8:44 am
Category:
The Halides Mineral Class
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