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The chemical composition of mineral Jeanbandyite is indicated by the formula Fe3+0.7Mn2+0.2Sn0.8(OH)6. This mineral is commonly found occurring at the oxide zone of polymetallic hydrothermal deposits epitaxially overgrown on wickmanite or natanite. Llallagua, Bolivia. Jeanbandyite was named for Jean A. Bandy, Wickenburg, Arizona, USA, who, with her husband Mark Bandy, translated Agricola’s “De Natura Fossilium” from original Latin. Jeanbandyite is also known to crystallize in the tetragonal system of crystal formation. In optical mineralogy, this tetragonal system comprises crystals having three axes, which are all in a position perpendicular to one another. Two axes are usually found having the same or equal length. Jeanbandyite has good cleavage found in one direction and fair in the other, all of which can be found more clearly exhibited with the aid of petrographic polarizing microscopes. Jeanbandyite is usually found colored brown orange, red brown or pale yellow in hand sample. The density measure of this mineral is commonly found 4.41 grams per cubic centimeters. Most crystals of mineral Jeanbandyite are found transparent to translucent. The crystal habit of mineral Jeanbandyite as described on the field of optical mineralogy usually includes crystalline to coarse crystals occurring as well-formed coarse sized crystals. They can be also found in pseudo octohedral form where crystals show an octohedral outline. They can be also found striated where there can be parallel lines found on crystal surface or cleavage face. The hardness measure of mineral Jeanbandyite is commonly found 3.5 when evaluated with the use of the Mohs scale method. Jeanbandyite is commonly found showing vitreous to adamantine luster when viewed in reflected light of polarizing microscopes. Mineral Jeanbandyite is usually found leaving light yellow streak when rubbed on white porcelain streak plate. Mineral Jeanbandyite is found to have uniaxial negative figure with 0.0040 birefringence when evaluated between crossed nicols of polarizing microscopes. Jeanbandyite is found to be not radioactive.



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Friday, September 30th, 2011 at 12:58 am
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Optical Mineralogy
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Click Here For Best Selection Of High Quality Polarizing Microscope