Definition of armangite in English:

armangite

Pronunciation /ɑːˈmaŋɡʌɪt/

noun

Mineralogy
  • A rare manganese arsenite mineral found in the Långban mines in Sweden, occurring chiefly as short black or brown hexagonal prisms.

    Formula: Mn₂₆As₁₈O₅₀(CO₃)(OH)₄. Crystal system: trigonal.

Origin

1920s. From ar- + mang- + -ite.