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The chemical composition of mineral Calcioferrite is indicated by the formula Ca4Fe++(Fe+++,Al)4(PO4)6(OH)4•12(H2O). This mineral is most commonly found in a bed of Tertiary clay. Calcioferrite is known as the Fe-analog of montgomeryite. Mineral Calcioferrite is most commonly found at its type of locality at Battenberg, Bavaria, Germany. Mineral Calcioferrite was named for its composition. Calcioferrite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis.

Mineral Calcioferrite is commonly found showing perfect cleavage in one direction and very good in the other. All of which can be found more clearly visible when viewed under polarizing microscope used in the field of optical mineralogy. Calcioferrite is usually found greenish yellow, yellow, yellow green, or yellowish white in hand sample. The specific gravity measure of the mineral is most commonly found 2.53 grams per cubic centimeters. Most crystals of mineral Calcioferrite are found translucent to opaque in appearance. Mineral Calcioferrite is usually found showing brittle fracture that is generally displayed by glasses and most non-metallic minerals. The crystal habit of mineral Calcioferrite as described in the field of optical mineralogy is usually foliated showing two dimensional platy forms. It can be also found reniform showing “Kidney like” shaped crystals. The hardness measure of mineral Calcioferrite when it is evaluated using the Mohs scale method is usually found 2.5. Mineral Calcioferrite is most commonly found showing pearly luster when evaluated closely in reflected light of petrographic polarizing microscope used in the field of optical mineralogy. Calcioferrite is most commonly found leaving a yellowish white streak when rubbed on a white porcelain streak plate. This mineral is usually found showing biaxial negative figure when evaluated closely betweeb crossed nicols of petrographic polarizing light microscope used in the field of optical mineralogy. It also exhibits 0.0110 birefringence. Calcioferrite is non-radioactive mineral.



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Monday, August 30th, 2010 at 6:08 am
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Optical Mineralogy
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