marekanite noun2 •An Apache tear (obsidian nodule).Marekanite balls from Corinto in Nicaragua are described; they are about the size of hazel-nuts, and black, with vitreous lustre. — 1899 •The material which such nodules consist of.But the nature of marekanite is now well understood. It is the perlitic or subpumiceous modification of a glassy rhyolitic rock in situ on […] — 1897 formsmarekanites
