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The chemical formula of mineral Arrojadite is indicated by KNa4CaMn++4Fe++10Al(PO4)12(OH,F)2. This mineral is usually found occuring at a high temperature, approximately 800 degrees C, primary mineral in granite pegmatites. At present, this is the series name. This can be found at its type of locality in Brazil, from the Sierra Branca pegmatite, 13 km south of Pedra Lavrada, Picui, Paraiba; in the Enio pegmatite mine, northeast of Galileia, and the Sapucaia pegmatite mine. Arrojadite was named to honor Miguel Arrojado Ribeiro Lisboa (1872-1932), Brazilian geologist. Arrojadite {1925) is renamed arrojadite-(KFe) and arrojadite becomes the group name. Arrojadite 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.

           

Arrojadite is usually found showing distinct cleavage in one direction which can be seen more clearly visible when viewed under polarizing microscope used in the field of optical mineraloggy. Mineral Arrojadite is usually found olive green, clove brown, or yellow that can be more fascinating when viewed under polarized microscope for mineralogists. The specific gravity measure of the mineral is usually found 3.46 grams per cubic centimeters. Most crystals of mineral Arrojadite are found translucent in appearance. Mineral Arrojadite is usually found exhibiting conchoidal to uneven fracture usually producing small, conchoidal fragments. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually found 5. Mineral Arrojadite is commonly found exhibiting vitreous to greasy luster when viewed in reflected light of polarizing microscopes. Arrojadite is usually found leaving a green gray streak when rubbed on a white porcelain streak plate. Arrojadite is usually foundd showing a biaxial positive figure when evaluated between crossed nicols of petrographic polarizing light microscope used in the field of optical mineralogy. It is usually found showing 0.0110 birefringence. Arrojadite has a barely detectable radioactivity.



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Wednesday, June 30th, 2010 at 1:47 am
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Optical Mineralogy
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