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The chemical formula of mineral Delrioite is indicated by CaSrV2O6(OH)2•3(H2O). Delrioite is commonly found occurring as coatings on sandstone. This mineral is usually found from its type of locality at Jo Dandy mine, Montrose County, Colorado, USA. Delrioite was named for Andres M. del Rio (1764-1849), Mexican mineralogist, who discovered vanadium. Delrioite 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 Delrioite is commonly found colored yellow brown, light yellow green or dark green in hand sample. The density measure of mineral Delrioite is found to be 3.1 grams per cubic centimeters. Most crystals of mineral Delrioite are found translucent appearance. The crystal habit of mineral Delrioite as described in the field of optical mineralogy usually includes acicular crystals occurring as needle-like crystals which can be more fascinating when evaluated with the aid of polarized microscope. It can be also found in aggregates form. This is made of numerous individual crystals or clusters. Mineral Delrioite is also found in radial form with crystals radiating from a center without producing stellar forms similar to stibnite. The hardness measure of mineral Delrioite is usually found 2 when evaluated using the Mohs scale method. Mineral Delrioite is also showing vitreous or glassy luster in reflected light of polarizing microscope. Delrioite is leaving a pale yellow green streak when rubbed on white porcelain streak plate. Mineral Delrioite is also found with biaxial negative figure and 0.0830 birefringence when specimen is evaluated between crossed nicols of polarizing microscope for mineralogists. Delrioite is also known to be pleochroic showing colorless, pale yellow and yellow color. Delrioite is found to be not radioactive when chemically evaluated.



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Tuesday, January 31st, 2012 at 4:14 am
Category:
Optical Mineralogy
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