Zinkenite

Zinkenite is a steel-gray metallic sulfosalt mineral composed of lead antimony sulfide Pb₉Sb₂₂S₄₂. Zinkenite occurs as acicular needle-like crystals.<ref>http://webmineral.com/data/Zinkenite.shtml Webmineral data</ref>

It was first described in 1826 for an occurrence in the Harz Mountains, Saxony-Anhalt, Germany and named after its discoverer, German mineralogist and mining geologist, Johann Karl Ludwig Zinken (1790–1862).<ref>http://rruff.geo.arizona.edu/doclib/hom/zinkenite.pdf Handbook of Mineralogy</ref><ref>http://www.mindat.org/min-4417.html Mindat</ref>

References

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