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The chemical formula of mineral Alvanite is indicated by (Zn,Ni)Al4(VO3)2(OH)12•2(H2O). Alvanite is usually found in the oxidation zone of a vanadiferous clay-anthraxolite horizon. It can be found at its type of locality at several mines of the Kurumsak and Balasauskandyk districts, northwestern Kara-Tau Mountains, Kazakhstan. Alvanite was named for the Aluminum and VANadium contents in its composition. Alvanite 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. 

            Mineral Alvanite is usually found showing prefect cleavage in one direction when viewed with the aid of petrographic polarizing light microsope used in the field of optical mineralogy. Alvanite is usually found buish green, blue black or black in color when viewed with the aid of polarizing microscope used in the field of optical mineralogy. The specific gravity measure of mineral Alvanite is usually found ranging from 2.41 to 2.49 grams per cubic centimeters which is usually 2.45 at the average. The hardness measure of mineral Alvanite is usually found between 3 to 3.5. Alvanite is usually found showing vitreous luster when viewed in reflected light of polarized microscope used in optical mineralogy. Alvanite is usually found leaving gray streaks when rubbed on a white porceln streak plate. Alvanite is usually found showing biaxial negative figure when evaluated with the aid of polarizig miocroscope used in optical mihneralogy. Alvanite is usually found exhibiting 0.0560 birefringence. Alvanite is a non-radioactive mineral as evaluated.



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Sunday, May 30th, 2010 at 7:05 am
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Optical Mineralogy
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