lechatelierite

a natural silica glass (silicon dioxide, SiO2) that has the same chemical composition as coesite, cristobalite, stishovite, quartz, and tridymite but ... [2 related articles]
Found on http://www.britannica.com/eb/a-z/l/28

Lechatelierite

Lechatelierite is silica glass, amorphous SiO2. One common way in which lechatelierite forms naturally is by very high temperature melting of quartz sand during a lightning strike. The result is an irregular, branching, often foamy hollow tube of silica glass called a fulgurite. Lechatelierite also forms as the result of high pressure shock metamo...
Found on http://en.wikipedia.org/wiki/Lechatelierite
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