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The chemical formula of mineral Acuminite is indicated by SrAlF4(OH).(H2O). It is usually found in the Ivigtut cryolite deposit at Southwestern Greenland, its type of locality. Acuminite was named from the Latin acuminis which means sharp point, for spearhead, the characteristic shape of the crystals. Acuminite is known to crystallize in the monoclinic-prismatic system of crystal formation.

The cleavage of mineral Acuminite is usually found perfect when viewed with the aid of petrographic polarizing microscopes used in the field of optical mineralogy. Acuminite crystals are most commonly found colorless in appearance. The specific gravity measure of mineral Acuminite is usually found to be 3.295 grams per cubic centimeters. Most crystals of mineral Acuminite are found transparent in appearance. The hardness measure of mineral Acuminite when it is evaluated using the Mohs scale method is usually found 3.5. It is also usually found showing vitreous luster when viewed in reflected light of petrographic polarizing light microscope used in the field of optical mineralogy. Acuminite is most commonly found leaving a white streak when rubbed on a white porcelain streak plate. Mineral Acuminite is most commonly found showing biaxial positive figure when evaluated with the aid of polarizing microscope used in the field of optical mineralogy. Acuminite is not radioactive.



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Sunday, February 14th, 2010 at 11:12 am
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Optical Mineralogy
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