lepidolitePronunciation: /ˈlɛpɪdəlʌɪt, lɪˈpɪdəlʌɪt/Definition of lepidolite noun [mass noun] a mineral of the mica group containing lithium, typically grey or lilac in colour. Origin: late 18th century: from Greek lepis, lepid- 'scale' + -litelepidolite in other Oxford dictionaries Definition of lepidolite in the US English dictionary