Definition of novákite in US English:

novákite

(also novakite)

noun

Mineralogy
  • A monoclinic arsenide of copper and silver, Cu₂₀AgAs₁₀, occurring in the Krkonose mountains of the northern Czech Republic, which is steel-grey on fresh fracture but becomes almost black on exposure to air.

Origin

1950s; earliest use found in American Mineralogist. From German Novákit from the name of Jiří Novák, Czech mineralogist + -it.