I find this an interesting article by Dan Eden on this Subject... Let's begin back in the 1960s with the Apollo 11 manned landing on the moon. On one of their EVA's (extra-vehicular aqtivities), the astronauts photographed and took samples from some small craters, about 20cm to 1.5 meters across. When they examined the floors of these craters they noticed what looked like glazed donuts. These were actually chunks of moon dirt that were coated by glass. The glazed areas are clearly concentrated toward the top surfaces of protuberances, although they exist also on some sides. Points and edges appear to be strongly favored for the glazing process. In some cases, droplets appear to have run down an inclined surface for a few millimeters and congealed there. [1] Hardly anyone in the general public was made aware of this discovery and, even if they were, thay could hardly have realized the significance. But in 1969, an article in Science by T. Gold [1] proposed a theory of how they were made. Glass, as we know, is made from melting sand. It occurs natually near sources of high temperature, such as volcanos and meteor impacts. The atom bomb tests in New Mexico's White Sands area produced a small "lake" of glass at ground zero. So it was never a question about the lunar glass also having been created by something very hot.
He said regarding 2012 Although "doomsday" is frequently linked with the Mayan calendar, this is just coincidental. December 12, 2012 is a significant day in astronomy because of a number of important events that will impact our Sun. It would be a "doomsday" even if we never knew about the Mayan calendar. Yet, the more we understand this ancient civilization and appreciate their knowledge of astronomy, we must assume they knew this date to be auspicious