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The chemical composition of mineral Dellaventuraite is indicated by the formula NaNa2(Mg2,Mn+++,Li,Ti)Si8O22O2. Dellaventuraite commonly occurs with leakeite, kornite, albite, braunite, and bixbyite associated with cross-cutting epigenetic veins that have reacted with regionally metamorphosed rocks containing Mn-rich minerals. Dellaventuraite is a known member of the Amphibole group. This mineral is commonly found from its type of locality at Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India. Dellaventuraite was named for Giancarlo Della Ventura, Università degli Studi di Roma Tre, for his extensive work on the crystal chemistry of synthetic amphiboles. Dellaventuraite 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 Dellaventuraite is known to have perfect cleavage in two different directions, all of which are more clearly exhibited when evaluated with the aid of polarizing microscope for geologists. It is commonly found pinkish red in hand sample. Most crystals of Dellaventuraite are found transparent in appearance. Crystals of this mineral are also found brittle. This is generally displayed by glasses and most non-metallic minerals. The crystal habit of mineral Dellaventuraite as described in the field of optical mineralogy usually includes anhedral grains. This is one of those granular minerals without the expression of crystal shapes. The hardness measure of Dellaventuraite is usually found 5 when evaluated using the Mohs scale method. Dellaventuraite specimens are found showing vitreous or glassy luster when viewed in reflected light of polarized microscope for mineralogists. Dellaventuraite is also leaving pale pink streak when rubbed on white porcelain streak plate. Mineral Dellaventuraite is known to be of biaxial positive figure with 0.0330 birefringence when specimen is evaluated between crossed nicols of polarizing microscope. Dellaventuraite is also found to have barely detectable radioactivity when chemically evaluated.



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Monday, January 30th, 2012 at 1:13 pm
Category:
Optical Mineralogy
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