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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 formula of mineral Jeppeite is indicated by (K,Ba)2(Ti,Fe+++)6O13. Jeppeite is usually found from a large, weathered lamproite plug. This mineral is most commonly found at its type of locality at Wolgidee Hills, West Kimberley district, Western Australia. Jeppeite was named for John Frederick Biccard Jeppe (1920-), geologist of Nedlands, Western Australia, discoverer of the mineral. Jeppeite 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. Mineral Jeppeite is commonly found showing perfect cleavage in one direction and good in the other, all of which are more clearly visible when evaluated closely with the aid of polarizing microscope for mineralogists. Most commonly found colored black in hand sample. The density measure of mineral is usually found 3.94 grams per cubic centimeters. Most crystals of mineral Jeppeite are found opaque in appearance. Mineral Jeppeite is also commonly found brittle in fracture. This is generally displayed by glasses and most non-metallic minerals. Mineral Jeppeite is also found acicular in form occurring as needle-like crystals. Jeppeite is also found showing prismatic crystals shaped like slender prisms similar to tourmaline. The hardness measure of the mineral Jeppeite is usually found ranging from 5 to 6 when evaluated using the Mohs scale method. Mineral Jeppeite is commonly found exhibiting submetallic luster when viewed in reflected light of polarized microscope for mineralogists. It is also found leaving a light brown streak when rubbed on white porcelain streak plate. Mineral Jeppeite is known to have biaxial figure with 0.2200 birefringence when evaluated between crossed nicols of polarized microscope used in the field of optical mineralogy. Mineral Jeppeite is found pleochroic exhibiting Capri blue, dark greenish brown and dark olive buff color under polarizing microscope. It is also commonly found showing weak bireflectance. The interference color of this mineral is usually found gray which may have golden internal reflections. The estimated radioactivity from Jeppeite is found to be barely detectable.



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Friday, September 30th, 2011 at 3:58 am
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Optical Mineralogy
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