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The chemical formula of mineral Alumoakermanite is indicated by (Ca,Na)2(Al,Mg,Fe++)(Si2O7). Alumoakermanite is usually found in evolved olivine free melilite-nephelinitic ashes and lapilli-tuffs as a silicate phase in non-carbonatite lavas. Alumoakermanite is a known member of the Melilite group. It is also known as the Aluminum dominant analogue of akermanite. Alumoakermanite can be also found and its type of locality at Oldoinyo Lengai volcano, Tanzania. Alumoakermanite was named as the Aluminum analog of akermanite.

            Mineral Alumoakermanite is known to crystallize in the tetragonal system of crystal formation. In optical mineralogy, this tetragonal system comprises crystals having three axes, which are all in a position perpendicular to one another. Two axes are usually found having the same or equal length. The crystal habit of mineral Alumoakermanite as described in the field of optical mineralogy usually includes tabular forms. In optical mineralogy, this classification of mineral usually forms dimensions that are thin in one direction. The hardness measure of mineral Alumoakermanite when it is evaluated using the Mohs scale method is usually rangng from 4 to 5. Alumoakermanite is usually found showing biaxial negative figure when evaluated between crossed nicols of petrographic polarizing microscope used in the field of optical mineralogy. It is also usually found showiong birefringence ranging from 0.0090 to 0.0110. Alumoakermanite is a non-radioactive mineral as evaluated.



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Sunday, May 30th, 2010 at 6:37 am
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Optical Mineralogy
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