From 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]
From WordNet (r) 3.0 (2006) :
lechatelierite
n 1: colorless glass made of almost pure silica [syn: quartz
glass, quartz, vitreous silica, lechatelierite,
crystal]