Gemological Properties - Tektites are still poorly understood. They have no crystal structure, and are therefore similar to obsidian, but are not associated with volcanic processes. Their chemistry is unique and unexplained. It is postulated that many odd events occur during a meteor's impact because of the tremendous heat and pressure produced. Tektites may be fused glass that formed during an impact of a meteor with layers of rock on the Earth's surface.
Tektites occur in broad bands in specific localities in different parts of the world.
These bands produce characteristically similar tektites and are sometimes loosely associated with meteorite craters or suspected craters. Many believe so and this idea is gaining acceptance from many scientists. The odd and diverse chemistry of the tektites could be a result of unique meteorites hitting unique rock types with the combinations producing particular effects. Some tektites, called Moldavites, are especially prized for their clarity and unique green color. Moldavites are sometimes cut as gemstones or put into jewelry as natural uncut pieces to show off their often eerie and beautifully intricate shapes.