Location: Preguiça Mine, Sobral da Adiça, Moura, Beja, Portugal.
Willemite cluster of small transparent, white or yellowish green, submillimetric prismatic crystals, with vitreous lustre on a matrix of white earthy Hydrozincite or Limonite (ocher color). Mineralization of the supergenic enrichment zone of a deposit of zinc and lead with the generation of a gossan rich in carbonates, phosphates and Zn/Pb silicates.