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The chemical formula of mineral Johillerite is indicated by Na(Mg,Zn)3Cu(AsO4)3. This mineral Johillerite is commonly found in cavities at altered tennantite-chalcocite ore. Johillerite is most commonly found from its type of locality at Tsumeb, Namibia. Mineral Johillerite  was named for Johannes Eric Hiller (1911-1972), professor of mineralogy, Stuttart, Germany. Johillerite 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 Johillerite is commonly found showing perfect cleavage in one direction and good in two other directions, all of which are found more clearly visible when evaluated closely with the aid of polarizing microscopes used in the field of optical mineralogy. Mineral Johillerite is commonly found colored violet in hand sample. The density measure of mineral Johillerite is usually found 4.15 grams per cubic centimeters. Most crystals of mineral Johillerite are commonly found transparent in appearance. The crystal habit of mineral Johillerite as described in the field of optical mineralogy usually includes aggregates in form that is made of numerous individual crystals or clusters. Mineral Johillerite is also found forming radial crystals radiating from a center without producing stellar forms similar to that of the stibnite. The hardness measure of mineral is usually found 3 when evaluated using the Mohs scale method. This mineral is commonly found showing vitreous or glassy luster when evaluated in reflected light of polarized microscopes for mineralogists. It is also known to have biaxial positive figure with birefringence of 0.0680 when evaluated between crossed nicols of polarized microscope used in the field of optical mineralogy. The estimated radioactivity from Johillerite is barely detectable.



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Friday, October 14th, 2011 at 4:02 am
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Optical Mineralogy
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