Definition of plattnerite in US English:

plattnerite

noun

Mineralogy
  • Native lead dioxide, PbO₂, crystallizing in the tetragonal system and occurring as black crystals or black-brown masses.

Origin

Mid 19th century; earliest use found in James Nicol (1810–1879), geologist. From the name of K. F. Plattner, German metallurgist who described the mineral + -ite, after German Plattnerit.

Pronunciation

plattnerite

/ˈplatnərʌɪt/