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The chemical formula of mineral Wurtzite usually include (Zn, Fe)S or Zinc Iron Sulfide. Wurtzite is actually a Sulfide mineral. It is also considered as a minor ore of zinc and it is also most commonly used as mineral specimen. Mineral Wurtzite is actually polymorphous with Sphalerite. They actually share the chemistry with a third, even rarer, mineral called Matraite. In the field of optical mineralogy, polymorph means it has many shapes. Crystals of mineral Wurtzite are typically found as six-sided pyramid where the hemimorphic character is easily seen with the aid of polarized microscope as easily seen as the top of the crystal is the point and the bottom of the crystal is the pyramid base. Often the crystals are platy with a hexagonal outline and the hemimorphic character is then not easily distinguished not unless evaluated under petrographic polarizing microscopes used in optical mineralogy. An aggregate of botryoidal crusts with layers of Wurtzite, galena, sphalerite and the one called Schalenblende. This one is sometimes cut and polished as an ornamental stone.

 The color of mineral Wurtzite is usually found light to dark brown almost black that appears more fascinating when viewed with the aid of polarizing microscopes used in the field of optical mineralogy. Wurtzite is also usually found exhibiting resinous to dull luster when viewed in reflected light of polarized microscopes for mineralogists. Most crystals of mineral Wurtzite are found showing transparent to translucent in appearance. Wurtzite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. The crystal habits of mineral Wurtzite usually include tapering hemimorphic six-sided pyramids and platy hexagonal crystals. It is also seen as acicular radiating crystal groups or as botryoidal crusts layered with galena and sphalerite. Mineral Wurtzite is most commonly found showing poor basal cleavage in one direction and good prismatic cleavage in three other direction, all of which can be found more clearly exhibited when mineral is viewed with the aid of petrographic polarizing light microscopes for mineralogists. Mineral Wurtzite is also usually found exhibiting uneven fracture when evaluated more closely with the aid of polarized light microscopes used in the field of optical mineralogy. The hardness measure of the mineral Wurtzite when it is evaluated using the Mohs scale method is usually found ranging from 3.5 to 4. The specific gravity measure of the mineral is approximately 4.0 grams per cubic centimeters, which is heavier than average, but light when compared to most metallic minerals. Wurtzite is most commonly found leaving a light brown streak when specimen sample is rubbed on a white porcelain streak plate. Mineral Wurtzite is also usually found with striations on pyramidal faces parallel to base, an index of refraction of about 2.36 to 2.38. Some specimens also fluoresce orange under ultraviolet light. It is also usually found associated with galena, pyrite and sphalerite. The best field indicators of mineral Wurtzite usually include cleavage, associations, crystal habit, streak and softness. Wurtzite notably occurs at several localities including Germany, Peru, Bolivia, England and some areas in USA.



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Friday, October 30th, 2009 at 3:00 pm
Category:
The Sulfides Mineral Class
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