Lepidomelane /(lĕp`ĭ*dŏm"ē̇*lān)/

Lep·i·dom·e·lane

Lepidomelane

n.
  1. 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. (Min.)