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Webster 1913 Edition
Ampelite
Am′pe-lite
(ăm′pē̍-līt)
, Noun.
 [L. 
ampelitis
, Gr. ἀμπελῖτις
, fr. ἄμπελοσ 
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. 
Webster 1828 Edition
Ampelite
AM'PELITE
,Noun.
  Cannel coal, or candle coal; an inflammable substance of a black color, compact texture, and resinous luster, and sufficiently hard to be cut and polished.  It burns with a bright flame, of a short duration; and gives but a moderate heat.  It is used like jet for making toys.  It is found in France and England, where husbandmen smear vines with it to kill vermin.