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The chemical formula of mineral Tennantite is indicated by Cu12As4S13 or Copper Arsenic Sulfide. Tennantite is actually a Sulfide mineral. Tennantite is considered as an ore of copper and also a minor ore of silver and arsenic. Mineral Tennantite is usually found showing splendid microscope images when viewed with the aid of polarizing microscopes used in the field of optical mineralogy. Tennantite also forms a series with the much more common mineral tetrahedrite. In the field of optical mineralogy, this means that the two minerals share the same crystal structure but they actually differ in the percentage of arsenic versus mineral antimony. It is actually difficult to distinguish the two minerals by ordinary means. Tennantite is generally found darker in color, showing redder streak and translucent red color that can be seen more clearly exhibited when thin splinters of the mineral are evaluated or held up to a strong light of petrographic polarizing microscopes used in the field of optical mineralogy. 

 

            Tennantite is actually a member of the informal mineral group called fahlerz or fahlores group. This group was named after the old German word which means pale ore. Most members of the tetrahedrite group belong to this informal group. Tennantite is usually found forming nice crystals and it can be a handsome specimen when viewed closely with the aid of polarized microscope for mineralogists. Tennantite is often found containing a certain percentage of silver and it is actually considered as its minor ore. Collectors are usually craving for nice verified Tennantite specimens.

 

            Mineral Tennantite is most commonly found exhibiting black to steel gray color that can be seen more splendidly exhibited when specimen is evaluated with the aid of petrographic polarizing light microscopes used in the field of optical mineralogy. Tennantite is usually found showing metallic luster when viewed in reflected light of polarizing microscope for mineralogists. Most crystals of mineral Tennantite are found opaque in appearance. Tennantite is known to crystallize in the isometric system of crystal formation. In optical mineralogy, this isometric crystal system comprises crystals having three axes, all of which are perpendicular to one another and all are found equal in lengths. The crystal habits of mineral Tennantite as described in the field of optical mineralogy usually include the tetrahedron and sometimes modified by the dodecahedron and tristetrahedron. It can be occasionally found showing twinned crystals when evaluated with the aid of polarized microscopes for mineralogists. It can be also found forming massive and granular specimens.

 

            Tennantite has absent cleavage even when it is viewed closely with the aid of petrographic polarizing microscopes for mineralogists. Tennantite is most commonly found showing subconchoidal fracture when viewed closely with the aid of polarizing microscopes used in the field of optical mineralogy. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually 3 to 4. Tennantite is most commonly found leaving a black to reddish streak when rubbed on a white porcelain streak plate. The specific gravity measure of the mineral is approximately 4.6 grams per cubic centimeters, which is considered average for metallic minerals. Tennantite is usually found associated with other interesting minerals including pyrite, chalcopyrite, quartz, arsenopyrite and many other sulfides. Thin splinters of mineral Tennantite can be found showing translucent red color that can be very interesting when viewed with the aid of polarized microscopes for mineralogists. The best field indicators of mineral Tennantite usually include color, crystal habit, streak and lack of cleavage. Tennantite notably occurs at several localities including Namibia, Switzerland, Germany and some areas in USA.



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Thursday, August 13th, 2009 at 2:17 pm
Category:
The Sulfides Mineral Class
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