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The chemical composition of mineral Bornemanite is indicated by the formula BaNa3{(Na,Ti)4[(Ti,Nb)2O2Si4O14](F,OH)2}•PO4. Bornemanite is usually found as late hydrothermal mineral. This mineral is most commonly found at its type of locality at Yubileinaya (Jubilee) alkalic pegmatite, Mt. Karnarsut, Lovozero massif, Kola Peninsula, Russia. Bornemanite was named for Irina Dimitrievna Borneman-Starynkevich (1890-), Russian mineralogist, Institute of Ore Deposits, Moscow. She was a student of the mineralogy of the Khibiny and Lovozero massifs. Bornemanite 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 Bornemanite is usually found showing perfect cleavage when viewed closely under polarizing microscopes used in the field of optical mineralogy. This mineral is commonly found colored light yellow in hand sample. The specific gravity measure of this mineral is most commonly found ranging from 3.47 to 3.5 grams per cubic centimeters, giving an average of 3.48. Most crystals of mineral Bornemanite are found transparent to translucent in appeaarance. The crystal habit of this mineral as described in the field of optical mineralogy usually includes aggregates which are usually made of numerous individual crystals or clusters. It can be also found platy with sheet forms like micas. The hardness measure of the mineral Bornemanite as described using the Mohs scale method is usually found ranging from 3.5 to 4. Bornemanite is also commonly found showing pearly luster in reflected light of polarizing microscope used in the field of optical mineralogy. It is also most commonly found leaving a white streak when rubbed on a white porcelain streak plate. Mineral Bornemanite is commonly found showing biaxial positive figure when viewed closely between crossed nicols of polarizing microscopes. It is also most commonly found showing birefringence ranging from 0.0360 to 0.0370. Bornemanite is found to be pleochroic showing colorless and pale yellowish brown color. Bornemanite has a barely detectable radioactivity as evaluated.



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Saturday, February 19th, 2011 at 7:57 am
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Optical Mineralogy
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