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The chemical formula of mineral Pachnolite is indicated by NaCaAlF6 – H2O or Hydrated Sodium Calcium Aluminum Fluoride. Pachnolite is actually a rare and unusual Halide mineral. Pachnolite is most commonly used as mineral specimen and it is most often found exhibiting nice and interesting microscope images when viewed with the aid of polarizing light microscope used in the field of optical mineralogy. The symmetry of mineral Pachnolite is quite unusual in that it is monoclinic, not unusual for minerals in general as many minerals are monoclinic, but unusual for Halide minerals. It has been found in the field optical mineralogy that Pachnolite forms from the alteration of cryolite, another unusual halide mineral which by no small chance is associated with Pachnolite. Mineral Pachnolite is also found with the mineral thomsenolite, which has the same chemistry as Pachnolite but has a slightly different structure. The better cleavage and softness of thomsenolite and its more obvious monoclinic crystal habit serve to distinguish it from Pachnolite. Both minerals are found as druses lining the pockets of the very unique pegmatitic rocks at Ivigtut, Greenland.

 

            Mineral Pachnolite is most commonly found colorless, white or stained to brown by limonite. Pachnolite is also usually found exhibiting vitreous luster when viewed in reflected light of petrographic polarizing microscope used in the field of optical mineralogy. Crystals of Pachnolite mineral are most commonly found transparent to translucent in appearance. The crystal habit of mineral Pachnolite as described in the field of optical mineralogy usually includes prismatic crystals with steep pyramidal terminations that can be seen more clearly visible when viewed with the aid of polarized microscopes. Pachnolite is also commonly found showing pseudo-orthorhombic twinned prismatic crystals. However, it is also important to note that tabular crystals are considerably rare in occurrence. Pachnolite is usually found showing a very indistinct cleavage when specimen is viewed with the aid of petrographic polarizing light microscope. Pachnolite is also known to be having a conchoidal fracture when viewed with the aid of polarizing microscope used in optical mineralogy. The hardness measure of mineral Pachnolite when it is evaluated using the Mohs scale method is usually 3. When Pachnolite specimens are rubbed on a white porcelain streak plate, it is most commonly leaving a white steak. The specific gravity measure of the mineral Pachnolite is usually found to be 2.98 grams per cubic centimeters which is considered average. Mineral Pachnolite is most commonly found associated with cryolite, thomsenolite, limonite, and ralstonite. The best field indicators of minerals Pacchnolite are limited to Ivigtut, Greenland.



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Monday, June 1st, 2009 at 4:06 am
Category:
The Halides Mineral Class
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