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The chemical formula of Abenakiite-(Ce) is indicated by Na26REE6(SiO3)6(PO4)6(CO3)6(SO2)O. Abenakiite-(Ce) was named for the Abenaki Indian tribe, which inhabited the area around Mont Saint-Hilaire. Abenakiite-(Ce) is usually found as a single crystal that is embedded in sodalite in a xenoliths of sodalite syenite. Abenakiite-(Ce) is known to crystallize in the trigonal-hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. The type of locality of Abenakiite-(Ce) is Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada.  Abenakiite-(Ce) is most commonly found showing poor cleavage when viewed with the aid of petrographic polarizing light microscope used in optical mineralogy. Abenakiite-(Ce) is usually found in pale brown color that can be seen more interesting when viewed with the aid of polarized microscopes used in optical mineralogy. The specific gravity of mineral Abenakiite is usually found 3.21 grams per cubic centimeters. Abenakiite-(Ce) crystals are usually found transparent in appearance. Abenakiite-(Ce) is most commonly found showing brittle conchoidal fracture when viewed under petrographic polarizing light microscopes. In the field of optical mineralogy, these usually appear very brittle fracture producing small, conchoidal fragments. Abenakiite-(Ce) is most commonly found producing euhedral crystals and they usually occur as well-formed crystals showing good external form. The hardness measure of mineral Abenakiite-(Ce) when it is evaluated using the Mohs scale method is usually 4. Abenakiite-(Ce) crystals are most commonly found non-fluorescent in appearance. Abenakiite-(Ce) is most commonly found showing vitreous luster when viewed in reflected light of polarizing microscopes used in the field of optical mineralogy. Abenakiite-(Ce) is most commonly found leaving a white streak when rubbed on a white porcelain streak plate. Abbenakiite-(Ce) is not a dichroic mineral. It is however found exhibiting a uniaxial negative figure under polarizing microscopes. Its birefringence is usually found 0.0030. Abenakiite-(Ce) is a radioactive mineral. Therefore, it should be keep away from other minerals that are easily affected by radioactivity. Human exposure should be limited.



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Sunday, February 14th, 2010 at 11:24 am
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Optical Mineralogy
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