Abstract
The glass found around the impact crater of Aouelloul is a kind of silicic tektite similar to Darwin glass. As such, it furnishes a useful test of theories of the origin of tektites. In the particular case of Aouelloul, the question is whether (a) the glass, in the form of a glass meteorite, produced the crater by impact, or (b) the crater, under impact from a meteorite, formed the glass. New data on silicate diffusion coefficients show clearly that the glass could not have formed from the sandstone during the few seconds of intense heating associated with an impact. The time required at 1800°C to homogenize the glass is estimated as several days. It thus appears that Aouelloul glass is meteoritic in origin and thus implies a meteoritic origin for other tektites.
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