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The chemical formula of mineral Juonniite is indicated by CaMgSc(PO4)2(OH)•4(H2O). This mineral is commonly found at metasomatically reworked calcite-phlogopite-clinohumite-magnetite ores in a calcite-dolomite carbonatitic stockwork zone. Juonniite is also considered as the scandium dominant analog of overite and segelerite. Juonniite is commonly found from its type of locality at Kovdor ultramafic alkaline complex, Yona or Juonni River (from the Russian or Finnish), Kola Peninsula, Russia). The name Juonniite alludes to the locality. Pronounced YO’NAITE. Juonniite is known to crystallize in the orthorhombic system of crystal formation. In optical mineralogy, this orthorhombic crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths. Mineral Juonniite has no cleavage found displayed even when evaluated using the Mohs scale method. Juonniite is commonly found colorless, light yellow, yellowish brown, gray, or bright orange in hand sample. The density measure of mineral Juonniite is commonly found 2.43 grams per cubic centimeters. Most crystals are found translucent in appearance. Crystals of mineral Juonniite are also found with brittle or uneven fracture. This is a very brittle fracture producing uneven fragments. The crystal habit of mineral Juonniite as described in the field of optical mineralogy usually includes platy – sheet forms similar to micas. It can be also found in spherical form showing spherical, rounded aggregates that are very interesting when viewed under polarized microscope. The hardness measure of mineral Juonniite is usually found ranging from 4 to 4.5 when evaluated using the Mohs scale method. Mineral Juonniite is also found with vitreous or glassy luster when viewed in reflected light of polarizing microscope for mineralogists. Mineral Juonniite is also found leaving a white streak when rubbed on white porcelain streak plate. Mineral Juonniite is also found showing biaxial negative figure with 0.0080 birefringence when specimen is evaluated between crossed nicols of polarized microscope. Mineral Juonniite is also found to be not radioactive when chemically evaluated.



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Thursday, December 29th, 2011 at 8:58 am
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Optical Mineralogy
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