Definition of plumbojarosite in US English:

plumbojarosite

noun

Mineralogy
  • A mineral of the hexagonal crystal system consisting of a basic sulphate of lead and ferric iron, PbFe₆(SO₄)₄(OH)₁₂, and occurring as brown crusts or compact masses, especially as a secondary mineral in lead ores in arid regions.

Origin

Early 20th century.