I was looking through an old astronomy book once and found a black and white photo of a meterite that was opened - inside was differant material than the outer shell and although no colors was apparent they appeared as rectangular areas spaced throughout the material of the shell, like fruit in jello.

I found some information about the 'theory' behind some of the materials found looking up some of the key words you gave

"Tektites are still poorly understood. They are irregularly- and at times intricately-shaped nodules and blobs of a glassy substance. They have no crystal structure, and are therefore similar to obsidian, but are not associated with volcanic processes. Their chemistry is unique and somewhat unexplained.
The leading theory concerning their origin is the "Meteorite Impact Theory". 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. Could these fields represent splash material from an impact? 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. "

www.galleries.com/minerals/...ktites.htm