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The chemical formula of mineral Caresite is indicated by Fe++4Al2(OH)12CO3•3(H2O). This mineral is usually found occuring in silicate and carbonate cavities and in nepheline syenite pegmatites. Mineral Caresite is commonly found at its type of locality at Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, as well as in the Corporation quarry, Montreal, Quebec, Canada. Caresite was named after Steve Cares (1909-) and Janet Cares (1921-) of Sudbury, MA, Canada, who found the mineral. Mineral Caresite is known to crystallize in the trigonal system of crystal formation. Mineral Caresite is commonly found showing perfect cleavage when evaluated closely with the aid of polarizing microscopes. Mineral Caresite is commonly found colorless, yellow or orange brown color in hand sample. Mineral Caresite is also showing density measure ranging from 2.57 to 2.59 grams per cubic centimeters, with an average of 2.58. Most crystals of mineral Caresite are found transparent in appaerance. Mineral Caresite is usually found forming brittle crystals. This is generally displayed by glasses and most non-metallic minerals. Mineral Caresite is also found forming prismatic crystals shaped like slender prisms just like that of tourmaline. Mineral Caresite is also found tabular in form showing dimensions are thin in one direction. The hardness measure of mineral Caresite is usually found 2 when evaluated using the Mohs scale method. Mineral Caresite is also found showing vitreous or glassy luster when evaluated closely under polarized microscope for mineralogy. Caresite is also found leaving white streak when rubbed on white porcelain streak plate. Caresite is usually found showing uniaxial negative figure when evaluated between crossed nicols of polarized micorscopes. Mineral Caresite is usually found showing 0.0290 birefringnce. Mineral Caresite is found to be not radioactive.



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Monday, May 9th, 2011 at 6:17 am
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Optical Mineralogy
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