Stickbender55, do like it was said, and get your back pack, take a small rock hammer, or any hammer, and go along the creek bed, and start whacking rocks. If it looks, like it might knap, take it with you. Then once you see what it looks like on the outside, you will be able to identify it later.
Down here in certain parts of Fla. there is some nice agatized coral, but it looks, like plain ol limestone, or old coral, till you break off a chunk of it. After it is heat treated it makes, beautiful stuff. Nice jewelry also, as can be seen by "JCINPC" . Good luck. If you just want a fire starter kit, I can tell you how to make a very reliable, and easy kit to make. Not flint N steel, but modern, but so simple, and effective.
Wayne
" The Original Stickbender"