[meteorite-list] Composition of Tektites

[JoshuaTreeMuseum]

After a brief conversation with Dr. Carl Allen's wife Jackie, a 
volcanologist,  I seem to recall her saying that most of  the glass on the 
surface of the moon was basaltic in nature, from volcanic action billions of 
years ago when the moon's center was still hot enough to produce magma. The 
glass was then pulverized into tiny bits by micrometeorites.

Phil Whitmer