lepidomelane
Lep`i*dom"e*lane, n. Etym: [Fr. (Min.) Defn: 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.
Lep`i*dom"e*lane, n. Etym: [Fr. (Min.) Defn: 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.