- last post: 01.01.0001 12:00 AM PDT
From the books we know that the crystal bends time/space/gravity. We also know that humans are the only ones who can activate the index and when (in the books) Fred cut himself it activated the markings in the cavern on Reach.
This leads me to think that the index might be made of other crystals similar to the one that Dr. Hasley and the spartans found. I don't know how this affects anything, but its an idea.