The Collaborative International Dictionary of English v.0.48:

lechatelierite \lechatelierite\ n.
   A naturally occurring colorless glass made of almost pure
   silica, and found in fulgurites, which are produced by
   lightning striking sand.

   Syn: quartz glass, vitreous silica, crystal.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

lechatelierite
    n 1: colorless glass made of almost pure silica [syn: quartz
         glass, quartz, vitreous silica, lechatelierite,
         crystal]