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The chemical formula of mineral Johnbaumite is indicated by Ca5(AsO4)3(OH). This Johnbaumite is known as an analog of hydroxylapatite and (OH) analog of svabite. Johnbaumite is commonly found from its type of locality at Palmer Shaft, Franklin mine, Franklin, Sussex County, New Jersey, USA. Mineral Johnbaumite was named for John L. Baum (1916-), resident geologist of the New Jersey Zinc Co. and curator of the Franklin Mineral Museum, Franklin, New Jersey, USA. Johnbaumite 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. Mineral Johnbaumite is commonly found with distinct cleavage when viewed with the aid of polarized microscopes for mineralogists. This mineral Johnbaumite is also commonly found colorless or white in hand sample. The density measure of mineral Johnbaumite is usually found 3.65 grams per cubic centimeters. Most Johnbaumite crystals are found transparent in appearance. The crystal habit of mineral Johnbaumite as described in the field of optical mineralogy usually includes anhedral grains forming granular minerals without the expression of crystal shapes. It can be also found massive in form with uniformly indistinguishable crystals forming large masses. The hardness measure of mineral Johnbaumite is usually found 4.5 when evaluated using the Mohs scale method. Johnbaumite is also found fluorescent under short ultraviolet light showing pink orange color. Mineral Johnbaumite is commonly found with vitreous or greasy luster when evaluated in reflected light of polarizing microscope used in the field of optical mineralogy. It is also commonly found leaving a white streak when rubbed on white porcelain streak plate. Johnbaumite is also found with uniaxial negative figure and 0.0030 birefringence when evaluated between crossed nicols of polarizing microscopes used in the field of optical mineralogy. Mineral Johnbaumite is found to be not radioactive.



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Friday, October 14th, 2011 at 4:36 am
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Optical Mineralogy
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