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The chemical formula of mineral Zinkenite is indicated by Pb9Sb22S42 or Lead Antimony Sulfide. Zinkenite is actually a Sulfide mineral. It is considered as a very minor ore of lead and it is most commonly used as mineral specimen. Zinkenite usually forms fine acicular crystals that appear as hair-like fibers that can be seen more clearly exhibited when viewed with the aid of polarized light microscope used in optical mineralogy. It can be noticed that the fibrous aggregates may be so thick as to cover a specimen with a mat of hair-like fibers or it may be sparsely disseminated between other minerals and it may also be confused with stray hairs or dark lint.

             Zinkenite is most commonly found steel gray to gray in color when viewed with the aid of polarized light microscopes used in the field of optical mineralogy. Zinkenite is usually found showing metallic luster when viewed in reflected light of petrographic polarizing microscope used in optical mineralogy. Most crystals of mineral Zinkenite are found opaque in appearance. Zinkenite 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 Zinkenite as described in the field of optical mineralogy usually include dense or sparse felted masses of acicular crystals. It can be also found in fibrous and compact plumose or feathery masses that can be seen more visible under petrographic polarizing microscope for mineralogists. Larger Zinkenite crystals show hexagonal prismatic and pyramidal forms. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually ranging from 3 to 3.5. The specific gravity measure of the mineral is usually ranging from 5.3 to 5.35 grams per cubic centimeters which is somewhat heavier than average for metallic minerals. Zinkenite is most commonly found leaving a steel gray streak when rubbed on a white porcelain streak plate. Crystals of mineral Zinkenite are usually brittle. Zinkenite is usually associated with arsenopyrite, quartz, jamesonite, and other sulfosalts. The best field indicators of mineral Zinkenite usually include luster, color, crystal habit and associations. Zinkenite has notable occurrence at several localities including Germany, Australia, Canada and some areas in USA.



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Tuesday, December 15th, 2009 at 2:53 pm
Category:
The Sulfides Mineral Class
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