Zinkenite

 ( Lead Minerals ) 

Zinkenite is a steel-gray metallic sulfosalt mineral composed of lead antimony sulfide lead₉antimony₂₂sulfur₄₂. Zinkenite occurs as acicular needle-like crystals.http://webmineral.com/data/Zinkenite.shtml Webmineral data

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).http://rruff.geo.arizona.edu/doclib/hom/zinkenite.pdf Handbook of Mineralogyhttp://www.mindat.org/min-4417.html Mindat