The most famous tektite is Moldavite, a rare green variety of tektite.
A tektite is formed when a meteorite hits the earth and large amounts of sand and debris are thrown high into orbit in the stratosphere. This material then re-enters the atmosphere and falls back to the earth. As it re-enters, it is subjected to high temperatures. A glasslike material is formed from the falling debris that is called tektite. Moldavite is a form of tektite, it gets its name from the area in Moldavia where it is found. Scientists believe the Moldavite was formed from a meteorite impact 14.8 million years ago.