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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The chemical composition of mineral Bobfergusonite is indicated by the formula Na2Mn++5Fe+++Al(PO4)6. Bobfergusonite is considered as an uncommon primary mineral in the intermediate zone of a granite pegmatite enriched in manganese and fluorine. His mineral is usually found at its type of locality from the Gotcha claim, on an island in Cross Lake, Manitoba, Canada. Bobfergusonite was named to honor Emeritus Professor Robert Bury Ferguson (1920- ), Canadian mineralogist, University of Manitoba, Winnipeg, Canada, especially for his contributions to pegmatite mineralogy. Bobfergusonite 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.

 

            Bobfergusonite is also most commonly found showing perfect cleavage in one direction which can be noticed more clearly visible when viewed closely under polarizing microscopes for mineralogists. Bobfergusonite is commonly found colored greenish brown or reddish brown in hand sample. The specific gravity measure of the mineral is usually found 3.54 grams per cubic centimeters. Most crystals of mineral Bobfergusonite are found transparent to subopaque in appearance. Bobfergusonite is also commonly found showing brittle fracture that generally displayed by glasses and most non-metallic minerals. The hardness measure of mineral Bobfergusonite when evaluated using the Mohs scale method is usually found 4. Bobfergusonite is commonly found showing resinous luster when viewed closely in reflected light of polarizing microscope used in the field of optical mineralogy. Bobfergusonite is commonly found leaving a yellowish brown streak when rubbed on white porcelain streak plate. Bobfergusonite is usually found showing biaxial positive figure when evaluated closely between crossed nicols of polarizing microscopes. It is also commonly found showing 0.0210 birefringence. Bobfergusonite is a non-radioactive mineral as evaluated.



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Saturday, January 15th, 2011 at 3:37 am
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Optical Mineralogy
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Click Here For Best Selection Of High Quality Polarizing Microscope