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The chemical formula of mineral Villiaumite is indicated by NaF or Sodium Fluoride. Villiaumite is actually a Halide mineral. It is also rarely cut as gemstone and could actually be found exhibiting nice and interesting microscope appearance when it is viewed with the aid of petrographic polarizing light microscopes used in the field of optical mineralogy. It is also used as mineral specimen and it could also be found showing nice and interesting microscope appearance under polarized microscopes. It has a typical bold red carmine color that is visually unique and is very fascinating when viewed with the aid of polarizing microscope used in optical mineralogy. The color of mineral Villiaumite is usually found ranging from the strong red to reddish orange, to lavender pink that can be very interesting when viewed with the aid of petrographic polarizing light microscopes used in the field of optical mineralogy. Villiaumite is also commonly found with colorless edges or portions that transition into the strongly colored portions of the crystal. Fluorescence is sometimes observed in many specimens, but is generally found weak red under both short and longwave ultraviolet light.         

 

            Mineral Villiaumite was named after Villiaume, the French explorer. Actually, he did not technically discover the mineral. He simply did collect some samples of rocks from Guinea in which the new mineral Villiaumite was found. Mineral Villiaumite is a nice and interesting piece of material to own. It has an excellent crystal form. It is most commonly found in cube form or sometimes octahedrons. Villiaumite is also often found associated with rare and interesting minerals. Villiaumite is usually found unique and often bright and bold. Its rarity, crystal from, association, color and fluorescence makes Villiaumite an interesting mineral to own.

             Mineral Villiaumite is most commonly found carmine red to reddish orange and lavender to pink color that appears more wonderful and fascinating when evaluated with the aid of petrographic polarizing microscope for mineralogists or the ones used in thee field of optical mineralogy. Most Villiaumite specimens actually show some colorless areas that can still be found very interesting when viewed under polarized microscopes. The luster exhibited by mineral Villiaumite is usually vitreous to waxy in massive specimens when viewed under polarizing microscope used in the field of optical mineralogy. Most crystals of mineral Villiaumite are found transparent to translucent in appearance when evaluated with the aid of petrographic polarizing light microscopes used in optical mineralogy. Mineral Villiaumite 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. The crystal habits of mineral Villiaumite as described in the field of optical mineralogy usually include small cubes, cubo-octahedrons and octahedrons. It is also found massive and as void-filling grains. 

            Mineral Villiaumite is most commonly found showing perfect cleavage found in three directions usually forming cubes that can be found more interesting when viewed under petrographic polarizing microscope used in the field of optical mineralogy. Villiaumite is also known to have conchoidal fracture which can be found more fascinating when viewed with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. The hardness measure of mineral Villiaumite when it is evaluated using the Mohs scale method is usually ranging from 2 to 2.5. Mineral Villiaumite is most commonly found leaving a pinkish white streak when specimens are rubbed on a white porcelain streak plate. The index of refraction exhibited by mineral Villiaumite under polarizing microscopes used in optical mineralogy is usually 1.327.  Villiaumite specimens as mentioned above are soluble in water. Some mineral specimens of mineral Villiaumite are weakly fluorescent in red color under ultraviolet light. The specific gravity measure of mineral Villiaumite is usually found to be 2.8 grams per cubic centimeters, which considered average value. Mineral Villiaumite is most commonly found associated with other interesting minerals including calcite, aegerine, pectolite, sodalite, Nepheline, microline, eudialyte, fluorite and among many other minerals.

 

            Mineral Villiaumite is a rare mineral that can be found only in a few localities. It is most commonly found massive in form usually the ones coming from Kola Peninsula where Villiaumite is most often found associated with many other rare Russian minerals such as nefedovite, lomonosovite, aegirine, pectolite, fluorcaphite, chkalovite and tuperssuatsiaite. Villiaumite can be also found in Mont Saint-Hilaire in Quebec, Canada. Fine Villiaumite crystals are usually found in this locality. Some crystals from this locality have been cut as gemstones, but it should be noted that Villiaumite is actually not a gemstone material as it is usually soft and is not durable to be used as a gemstone after all. Also, Villiaumite is soluble in water. To sum up things, Villiaumite is not really a gemstone material because of this property.  Villiaumite is sodium salt and just like other similar salts, they are usually soluble in water. For this reason alone, a desicant should be placed with any specimen to avoid moisture absorption and thus its possible destruction.  The best field indicators of mineral Villiaumite usually include color, occurrence, fluorescence, crystal habit, solubility in water and associations. Mineral Villiaumite also notably occurs at several localities including Rouma, the Islands of Los, Guinea as well as in Kola Peninsula in Russia, also in Namibia, New Mexico in USA, Quebec in Canada and also in Greenland.

 



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Wednesday, September 30th, 2009 at 3:47 am
Category:
The Halides Mineral Class
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