A velvet-black coal that is a variety of lignite. Its occult virtues
are thus described by Pliny (Historia naturalis, translated by
Philemon Holland, 1601)
‘‘In burning, the perfume thereof chaseth away serpents,
and bringeth women again that lie in a trance by the suffocation
or rising of the mother; the said smoke discovereth the
falling sickness and bewraieth whether a young damsel be a
maiden or no; the same being boiled in wine helpeth the toothache,
and tempered with wax cureth the swelling glandules
named the king’s evil. They say that the magicians use this jeat
stone much in their sorceries, which they practice by the means
of red hot axes, which they call axinomancia, for they affirm
that being cast thereupon it will burne and consume, if that ewe
desire and wish shall happen accordingly.’’
Jet was known in Prussia as black amber. (See also Electrum;