a lilac, pink, or greyish mica consisting of a hydrous silicate of lithium, potassium, aluminium, and fluorine, containing rubidium as an impurity: a source of lithium and rubidium. Formula: K2Li3Al4Si7O21(OH,F)3
lepidolite in American English
(lɪˈpɪdəˌlaɪt; ˈlɛpɪdoʊˌlaɪt)
noun
mica that contains lithium, commonly occurring in scaly masses of rose, lilac, or gray color