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The chemical formula of mineral Bonshtedtite is indicated by Na3Fe++(PO4)(CO3). This mineral is most commonly found in veinlets associated with alkai-carbonate metasomatism of alkalic massifs. Bonshtedtite is usually found in drill core from the Vuonnemiok River Valley, and on Mts. Suoluaiv, Kukisvumchorr, Partomchorr, and Rest’yun, Khibiny massif, also in drill core from the Kovdor massif, Kola Peninsula. This mineral was named to honor Elsa Maksimilianovna Bonshtedt-Kupletskaya (1897-1974), Russian specialist in mineralogy of alkalic massifs. Bonshtedtite 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.

            Bonshtedtite is most commonly found exhibiting perfect cleavage in two directions which can be found more fascinating when viewed closely under polarizing microscope used in the field of optical mineralogy. Mineral Bonshtedtite is most commonly found colorless, rose, yellowish or greenis in hand sample. All of which can be more interesting when viewed closely under polarizing microscope used in the field of optical mineralogy. The specific gravity measure of mineral Bonshtedtite is usually found ranging from 2.95 to 3.16 grams per cubic centimeters, giving an average of 3.05. Most crystals of mineral Bonshtedtite are found transparent in appearance. The hardness measure of mineral Bonshtedtite as measured using the Mohs scale method is usually found 4. Mineral Bonshtedtite is commonly found exhibiting vitreous to glassy lustere when viewed closely under polarizing microscopes used in the field of optical mineralogy. Bonshtedtite is most commonly found leaving white streak when rubbed on white porcelain streak plate. Mineral Bonshtedtite is usually found showing biaxial negative figure when evaluated between crossed nicols of polarized microscopes used in optical mineralogy. It is also usually found showing 0.0710 birefringence. Bonshtedtite is a non-radioactive mineral as evaluated.



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Saturday, February 19th, 2011 at 7:39 am
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Optical Mineralogy
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