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The chemical formula of mineral Vanadinite is indicated by Pb5(Vo4)3Cl or Lead Chlorovanadate. Vanadinite is actually a Phosphate mineral. It is most commonly used as mineral specimen and is also considered as a minor ore of lead. Vanadinite is usually found exhibiting nice and interesting microscope appearance when viewed with the aid of polarizing light microscope for mineralogists. Vanadinite is known to share the same structure with mineral Apatite. They also share the same crystal shapes at some times. Vanadinite is also a known member of the chemical series with two other minerals namely mimetite and Pyromorphite. It is also interesting to note that Vanadinite is usually found red while the rest of the members of the series and of the apatite group are not. The classic crystal habits of Vanadinite usually include short hexagonal prisms terminated by a pinacoid or a flat basal face. These crystals appear wider than they are long and are usually found more blade-like than the barrel shaped crystals that are so common in the Apatite Group of minerals. These habits are more clearly visible when viewed with the aid of polarizing microscopes for mineralogists. The high luster and deep red color exhibited by Vanadinite give the mineral a nice and interesting appeal to many mineral collectors.

 

            Vanadinite mineral is typically found showing bright red to orange color and also less commonly gray or brown in color that appears more fascinating when viewed with the aid of polarizing microscopes used in optical mineralogy. It is also usually found showing vitreous to adamantine luster when evaluated in reflected light of polarizing microscopes for mineralogists. Most crystals of mineral Vanadinite are found transparent to translucent in appearance. The crystal habit of the mineral Vanadinite typically includes the hexagonal prism with pinacoid as a termination. Rare Vanadinite crystals can have the hexagonal pyramid as a termination. It can also be found as rounded masses and crusts that can appear fascinating under polarized microscopes used in optical mineralogy.

 

            Vanadinite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. Mineral Vanadinite has no cleavage even when it is closely evaluated under polarizing microscope. Vanadinite is also usually found showing conchoidal fracture when viewed under polarizing microscopes for mineralogists. The hardness measure of the mineral Vanadinite when it is evaluated using the Mohs scale method is usually 3. Vanadinite specimens are usually found leaving a yellowish white streak when rubbed on a white porcelain streak plate. The specific gravity measure of the mineral is approximately 6.6+ grams per cubic centimeters, which is considered very heavy for translucent minerals. Vanadinite is usually found showing an index of refraction of about 2.39, which is typically high for lead minerals. Vanadinite crystal terminations can be hollowed out pitted but not as often as Pyromorphite or mimetite. Vanadinite is most commonly found associated with other interesting minerals including galena, wulfenite, barite, limonite and secondary lead deposit minerals. The best field indicators of mineral Vanadinite usually include crystal habit, density, color and high luster. Vanadinite notably occurs at several localities including Mexico, South Africa, Zambia, Namibia and Arizona in USA.

 



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Wednesday, September 30th, 2009 at 3:43 am
Category:
The Phosphates Mineral Class
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