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The chemical composition of mineral Johnsenite-(Ce) is indicated by the formula Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2. Johnsenite-(Ce) commonly occurs as an intergrown with zirsilite-(Ce) in a cavity near the margin of a marble xenolith in an igneous breccia along the contact between porphyritic nepheline syenite and sodalite sye nite. This mineral is a known member of the Eudialyte group. Johnsenite-(Ce) is also found at its type of locality at Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Mineral Johnsenite-(Ce) was named for Ole Johnsen (b. 1940), of the Geological Museum, University of Copenhagen, Denmark, and for his extensive research into the eudialyte group. Mineral Johnsenite-(Ce) is known to crystallize in the trigonal system of crystal formation. Johnsenite-(Ce) has no cleavage found even when evaluated closely under polarized microscopes used in the field of optical mineralogy. This mineral is also commonly found colored pale yellow or bright orange in hand sample. The density measure of this mineral Johnsenite-(Ce) is usually found 3.2 grams per cubic centimeters. Most crystals of mineral Johnsenite-(Ce) are found translucent to transparent in appearance. Johnsenite-(Ce) is also found having brittle to uneven fracture which is known as a very brittle fracture producing uneven fragments when viewed with the aid of polarized microscopes used in the field of optical mineralogy. Mineral Johnsenite-(Ce) is also found forming skeletal crystals forming crude outlines with missing faces. The hardness measure of mineral Johnsenite-(Ce) is usually found ranging from 5 to 6 when evaluated using the Mohs scale method. Mineral Johnsenite-(Ce) is also found exhibiting vitreous or glassy luster when viewed in reflected light of polarizing microscopes for mineralogists. Mineral Johnsenite-(Ce) is also found leaving a white streak when rubbed on white porcelain streak plate. Mineral Johnsenite-(Ce) is also found showing uniaxial negative figure with 0.0110 birefringence when viewed between crossed nicols of polarizing microscope used in the field of optical mineralogy. The estimated radioactivity from Johnsenite-(Ce) is commonly mild.



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Friday, October 14th, 2011 at 5:35 am
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Optical Mineralogy
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