A beautiful glass-like stone. According to ancient belief, if
the stone were hung about a child, it preserved him or her from
witchcraft, and if it were bound on the forehead, it stopped
bleeding of the nose, restored the loss of senses, and helped to
foretell future events. It is not clear what stone is indicated, and
it seems unlikely to have been the lignite, which is a brown or
black variety of coal.