Lechatelierite also forms as the result of high pressure shock metamorphism during meteorite impact cratering and is a common component of a type of glassy ejecta called tektites. Most tektites are blobs of impure glassy material, but tektites from the Sahara Desert in Libya and Egypt, known as Libyan desert glass, are composed of almost pure silica, that is almost pure lechatelierite. High pressure experiments have shown that shock pressures of 85 GPa are needed to produce lechatelierite in quartz grains embedded in granite.
Lechatelierite was formed during the impact of a meteorite into a layer of Coconino Sandstone at Meteor Crater in Arizona. It was puffed up to more than twice its size by steam and can now float on water.
Oxygen isotope constraints on the origin of impact glasses from the Cretaceous-Tertiary boundary. (glass spherules from Haiti)
Aug 21, 1992; Characterization of the composition of the rocks in the target area for the putative Cretaceous-Tertiary (K-T) boundary asteroid...