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]