Emily Dickinson Lexicon

THUM'ER-STONE, n.

A mineral so called from Thum, in Saxony, where it was found. It is called also axinite, from the resemblance of its flat sharp edges to that of an ax. It is either massive or crystalized; its crystals are in the form of a compressed oblique rhomboidal prism. It is of the silicious kind, and of a brown gray or violet color. Cyc.