Ampelite \Am"pe*lite\ ([a^]m"p[-e]*l[imac]t), n. [L. ampelitis,
Gr. 'ampeli^tis, fr. 'a`mpelos vine.] (Min.)
An earth abounding in pyrites, used by the ancients to kill
insects, etc., on vines; -- applied by Brongniart to a
carbonaceous alum schist.
[1913 Webster]