Leadhillite

Leadhillite


Composition: Pb4(SO4)(CO3)2(OH)2
Crystal System : Monoclinic; (ps.Trigonal)
Lustre : Adamantine, resinous
Hardness : 2.5-3.0
Specific Gravity : 6.45-6.55

Occurrence

  • Supergene
  • 1st Oxidation Zone
  • 2nd Oxidation Zone

Notable Finds

The best crystals, to 130 mm, were found in the second oxidation zone; a 90 mm crystal in the Harvard University collection (Harvard # 107992) is catalogued from 29 Level. However, large crystals were also found in the first oxidation zone as evidenced by specimens in the Karabacek collection at Harvard University, (ref. Harvard # 93920). Currier (2015) describes the purchase of three outstanding leadhillite specimens during a visit to Tsumeb in 1979; a photograph of one of these specimens, now in the MIM Museum, in Beirut, accompanies these notes.