Lechatelierite: The Silica Glass Inside Moldavite
Lechatelierite is natural silica glass — pure SiO₂ that melted above roughly 1,700 °C and cooled too fast to crystallise. It is not a mineral in the strict sense, because it has no crystal structure. Inside moldavite it shows up as pale, stretched needles and threads, and those inclusions are one of the more useful things
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