Definition of cryophyllite in English:

cryophyllite

Pronunciation /krʌɪə(ʊ)ˈfɪlʌɪt/

noun

rare Mineralogy
  • A lithium- and iron-containing mica, now regarded as a variety of lepidolite.

Origin

Mid 19th century; earliest use found in American Journal of Science. From cryo- + -phyllite, apparently so called on account of its fusing readily and its laminar structure.