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The chemical formula of mineral Deloneite-(Ce) is indicated by NaCa2SrCe(PO4)3F. Deloneite-(Ce) is commonly found forming in Carbonitite igneous rocks. This mineral was first found from Mount Koashva, Khibina alkaline massif, Kola Peninsula, Russia. Deloneite-(Ce) was named for B. N. Delone (Delaunay) (1890-1980), Russian mathematical crystallographer. Deloneite-(Ce) is known to crystallize in the trigonal system of crystal formation. This mineral has fair cleavage display in two different directions, all of which are more clearly exhibited when evaluated with the aid of polarizing microscope for mineralogists. Mineral Deloneite-(Ce) is commonly found colored bright yellow in hand sample. The density measure of the mineral is commonly found ranging from 3.92 to 3.95 grams per cubic centimeters with an average of 3.93. Most crystals of this mineral are found transparent in appearance. Deloneite-(Ce) crystals are known to be brittle. This is generally displayed by glasses and most non-metallic minerals. The crystal habit of mineral Deloneite-(Ce) as described in the field of optical mineralogy usually includes granular forms. This is generally occurring as anhedral to subhedral crystals in matrix. The hardness measure of mineral Deloneite-(Ce) is usually found 5 when evaluated using the Mohs scale method. Deloneite-(Ce) is also exhibiting vitreous or glassy luster in reflected light of polarizing microscope for geologists. It is found to be leaving a white streak when rubbed on white porcelain streak plate. Deloneite-(Ce) is known to have biaxial negative figure with 0.0220 birefringence when specimen is evaluated between crossed nicols of polarizing microscope. Deloneite-(Ce) is found to be weakly radioactive when chemically evaluated.



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Monday, January 30th, 2012 at 1:16 pm
Category:
Optical Mineralogy
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