Webster’s Revised Unabridged Dictionary · 1913
Lepidomelane
Lep′i·dom′e·lane (lĕp′ĭ·dŏm′ē·lān), n. [Gr. λεπίς -ίδος, a scale + μέλας, μέλαινα, black.] (Min.) An iron-potash mica, of a raven-black color, usually found in granitic rocks in small six-sided tables, or as an aggregation of minute opaque scales. See Mica.