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The chemical formula of mineral Armbrusterite is indicated by K5Na6Mn+++Mn++14[Si9O22]4(OH)10•4H2O. This mineral is usually found as a modulated manganese phyllosilicate. Armbrusterite is usually found at its type of locality at Mt. Kukisvumchorr, Kola Peninsula, Russia. Armbrusterite was named for Thomas Armbruster (b. 1950; University of Berne) for his outstanding contribution to structural mineralogy and crystallography, especially to the study of Mn-rich minerals. Armbrusterite 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. 

Armbrusterite is usually found showing perfect cleavage when evaluated with the aid petrographic polarizing microscope for mineralogists. It is most commonly found dark reddish brown in hand samples. The specific gravity measure of the mineral is usually found 2.78 grams per cubic centimeters. Most crystals of mineral Armbrusterite are found translucent to transparent in appearance. The fracture exhibited by mineral Armbrusterite is usually brittle to uneven, which is very brittle fracture producing uneven fragments. The crystal habit of mineral Armbrusterite as described in the field of optical mineralogy usually includes platy showing platy forms. It can be also found forming spherical rounded aggregates. The hardness measure of the mineral Armbrusterite when it is evaluated using the Mohs scale method is usually found 3.5. Armbrusterite is also usually found showing vitreous to glassy luster when viewed in reflected light of petrographic polarizing microscope for mineralogists. Armbrusterite is most commonly found leaving a light brown streak when rubbed on white porcelain streak plate. Armbrusterite has a barely detectable radioactivity as evaluated.



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Wednesday, June 30th, 2010 at 1:29 am
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Optical Mineralogy
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