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The chemical formula of mineral Dellaite is indicated by Ca6Si3O11(OH)2. Dellaite is commonly found occurring at late-stage veins cutting a metamorphic assemblage. It can be also found from its type of locality at Kilchoan, Ardnamurcan, Scotland. Dellaite was named for Della Martin Roy (1926-), Pennsylvania State University geochemist who first synthesized this phase. Dellaite is known to crystallize in the triclinic system of crystal formation. In optical mineralogy, this triclinic crystal system commonly comprises crystals having three axes, of which all are unequal in length and are positioned oblique to one another. Mineral Dellaite is commonly found colorless in hand sample. The density measure of mineral Dellaite is usually found 2.94 grams per cubic centimeters. Most crystals of mineral Dellaite are found transparent in appearance. Dellaite is usually found exhibiting vitreous or glassy luster in reflected light of polarized microscope. Mineral Dellaite is leaving white streak when rubbed on white porcelain streak plate. Dellaite is found to be not radioactive after chemically evaluated.



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Monday, January 30th, 2012 at 12:14 pm
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Optical Mineralogy
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