cryophyllite
/krʌɪə(ʊ)ˈfɪlʌɪt/Mineralogy. Now disused
noun
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.