Tektite is believed to be the product of meteorites that have crashed on Earth. They are similar in composition and appearance to volcanic glass, such as Obsidian, with colors generally ranging from black to green. Highly polished Tektite, which shows up its transparent green nature, is called Moldavite--and can be quite costly when cut into gem quality stones. An older, and less popular theory, is that Tektite particles result when a huge meteoroid or asteroid collides with the moon. The molten debris from the collision is thrown so forcefully from the moon, it eventually solidifies, and is drawn down to the Earth’s surface by gravity. It’s sometimes possible to identify the location of the Meteorite's crater by the shape of the Tektite.