Zinkenite

Zinkenite
Zinkenite, Fargo mine, Stevens County, Washington
General
Category	Sulfosalt minerals
Formula (repeating unit)	Pb9Sb22S42
Strunz classification	2.JB.35a
Crystal system	Hexagonal
Crystal class	Pyramidal (6) H-M symbol: (6)
Space group	P63

Zinkenite is a steel-gray metallic sulfosalt mineral composed of lead antimony sulfide Pb₉Sb₂₂S₄₂. Zinkenite occurs as acicular needle-like crystals.

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).