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            The chemical formula of mineral Arrojadite-(BaFe) is indicated by (Ba,K,Pb)Na3(Ca,Sr)(Fe++,Mg,Mn)14Al(PO4)11(PO3OH)(OH,F)2. This mineral is usually found in a phengitic quartzite. The species name sigimundite is replaced by the name arrojadite-(BaFe). Arrojadite-(BaFe) is usually found at its type of locality near Madesimo, Spluga Valley, Central Alps, Italy. This mineral was originally for Pietro Sigismund (1874-1962), renamed arrojadite-(BaFe) in 2005 by the IMA. Arrojadite-(BaFe) 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.



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Wednesday, June 30th, 2010 at 1:48 am
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Optical Mineralogy
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