Definition of polylithionite in English:

polylithionite

Pronunciation /ˌpɒlɪˈlɪθɪənʌɪt/

noun

Mineralogy
  • A mineral of the mica group that contains lithium (in a higher proportion than lepidolite, of which it was originally considered a variety) and potassium, and occurs as white, cream, or pink tabular crystals.

Origin

Late 19th century; earliest use found in American Naturalist. From German Polylithionit from poly- + Lithionit.