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The chemical composition of mineral Juanitaite is indicated by the formula (Cu,Ca,Fe)10Bi(AsO4)4(OH)11•2(H2O). It is considered as a secondary mineral in copper arsenate and sulfate mineral assemblage from primary sulfide ores (tennantite, chalcopyrite, and pyrite). Juanitaite is known to be chemically related to mixite. Mineral Juanitaite is also most commonly found from its type of locality at Gold Hill mine, Tooele County, Utah, USA. The name Juanitaite was derived from Juanita Curtis who first found the mineral. Juanitaite 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. Mineral Juanitaite is also most commonly found showing perfect cleavage in 2 different directions and good in the other which can be more clearly exhibited when mineral is evaluated with the aid of polarizing microscopes for mineralogists. Mineral Juanitaite is also commonly found olive green or grass green in hand sample. The density measure of mineral Juanitaite is usually found 3.61 grams per cubic centimeters. Most crystals of mineral Juanitaite are found translucent in appearance. The crystal habit of mineral Juanitaite as described in the field of optical mineralogy usually includes flexible forms with flexible fragments. It also forms microscopic crystals where crystals are visible only with the aid of polarizing microscopes for mineralogists. Mineral Juanitaite is also sometimes found in square form, occurring as square crystals in shape or outline. It can be also found in tabular form with dimensions that are thin in one direction. The hardness measure of mineral Juanitaite is found 1 when evaluated using the Mohs scale method. Juanitaite is also found with resinous luster in reflected light of polarizing microscope. It is also commonly found leaving a yellow streak when rubbed on white porcelain streak plate. Mineral Juanitaite is also found showing uniaxial negative figure with 0.0800 birefringence when specimen is evaluated between crossed nicols of polarizing microscope for geologists. Mineral Juanitaite is also found to be not radioactive when chemically evaluated.



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Thursday, December 29th, 2011 at 7:35 am
Category:
Optical Mineralogy
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