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The chemical formula of mineral Claringbullite is indicated by Cu4(OH)7Cl. This mineral is usually found in oxidized copper ore or slag, produced under chlorine-rich conditions. Mineral Claringbullite is usually found in Nchanga mine, Chingola, Zambia. Mineral Claringbullite was named for Gordon Frank Claringbull (1911-1990), formerly Keeper of Mineralogy and Director of the British Museum (Natural History), London, England. Mineral Claringbullite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. Claringbullite is also found with perfect cleavage in one direction which is more clearly exhibited when viewed closely under polarized microscopes. Mineral Claringbullite is usually found colored blue or light blue in hand sample. The density measure of mineral Claringbullite is usually found 3.9 grams per cubic centimeters. Claringbullite is usually found leaving a light blue streak when rubbed on white porcelain streak plate. Mineral Claringbullite is also found showing uniaxial negative figure with 0.0020 birefringence when evaluated closely between crossed nicols of polarized microscopes. Mineral Claringbullite is also found not radioactive.



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Saturday, July 30th, 2011 at 3:30 am
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Optical Mineralogy
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