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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The chemical formula of mineral Tantalite is indicated by (Fe, Mn)(Ta, Nb)2O6 or Iron Manganese Tantalum Niobium Oxide. Tantalite actually belongs to the Oxide and Hydroxide mineral class. Tantalite is also considered as an ore or tantalum and niobium. It is also used as mineral specimen and it is often found showing nice and interesting microscope images when viewed with the aid of polarizing light microscopes used in the field of optical mineralogy. Tantalite is also found forming a series with the mineral columbite. In the field of optical mineralogy, a series is formed when two or more elements can occupy the same places within a crystal structure and their respective percentage can then vary. Tantalite has also a dimorphic to another mineral called tapiolite. In optical mineralogy, a dimorph is a mineral that has the same chemistry but a different structure. Tantalite can be a nice addition to one’s collection. Good crystals are both handsome although complex in appearance when viewed closely with the aid of petrographic polarizing microscopes for mineralogists. Despite the fact that the color selection is usually limited to black to brown, it usually shows a generally good luster when viewed in reflected light of polarized microscope used in optical mineralogy.

 

            Tantalite is most commonly found dark black, iron-black to dark brown or even reddish brown in color that could appear more fascinating when viewed with the aid of petrographic polarizing light microscopes for mineralogists. Tantalite is also most commonly found showing submetallic luster to almost resinous when viewed closely in reflected light of polarizing microscopes for mineralogists. Tantalite crystals are nearly opaque in appearance and being transparent in thin splinters. Tantalite is known to crystallize in the orthorhombic system of crystal formation. The crystal habit of mineral Tantalite as described in the field of optical mineralogy usually includes stubby prismatic crystals with complexly faceted or rounded terminations. Tantalite is also usually found forming very flat tabular crystals sometimes aggregated together in parallel or nearly parallel groups. Tantalite crystals can be also found granular and massive in form.

 

            Mineral Tantalite is most commonly found showing good cleavage in only one direction which can be seen more clearly visible when mineral is viewed closely with the aid of petrographic polarizing light microscopes for mineralogists. Tantalite is also usually found showing subconchoidal fracture when viewed closely under petrographic polarizing light microscopes used in the field of optical mineralogy. The hardness measure of mineral Tantalite when it is evaluated using the Mohs scale method is usually ranging from 6 to 6.5. Tantalite is also most commonly found leaving a brownish-red to black streak when specimen sample is rubbed on a white porcelain streak plate. The specific gravity measure of the mineral is approximately 8.0+ grams per cubic centimeters when pure, which is very heavy for non-metallic minerals. Some Tantalite specimens may actually show a bluish iridescent tarnish and demonstrate weak magnetism. Tantalite is most commonly associated with albite, microcline, spodumene, apatite, cassiterite, tourmalines, beryl, amblygonite, microlite and albite. The best field indicators of mineral Tantalite usually include specific gravity, crystal habit, associations, and streak. Tantalite notably occurs at several localities including some areas in USA such as Maine, California, Colorado and Amelia, Virginia. It can be also found in Sweden, Norway and Finland.



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Sunday, August 30th, 2009 at 3:51 am
Category:
The Oxides and Hydroxides Mineral Class
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