nice find...for fire

[riverrat]

 yesterday i found a nice, bigger cobble of extremely hard flint/cortex material. and on my way back i found what i thought was a nice sized { golf ball} piece of very large grain sand stone. come to find out it aint sand stone at all. i broke it hitting the flint with it. almost in half. got one big piece and two smaller pieces. kind of crystalized on the inside. guess what? it sparks like crazy if you scratch it with that flint cobble.just tryed it outside in the dark. my son says "dad you could start a fire with that!" i was like, yep, i bet i could. ill post a pic after a bit.
come to find out, a rock i thought would make a good hammer stone also produces sparks hitting the flint.....Tony   
on the left side is that broke piece of rock.bottom left 2 pieces of flint that spark with rocks in picture.on right top that hammer stone that produces sparks when it hits them flint pieces.

[riverrat]

its funny i was just thinking of trying a fire with two rocks {flint} and i go out and find the right ones. its like im guided or something lol any idea of what would make the best possible tinder to catch these sparks? i have some char cloth i might try i made up a few days ago just to see how it would work.
just gave it a few whacks outside. i get lots of tiny sparks. but they dont last long. by the time they fall to the charcloth they are extinguished.so i tried to hold the charcloth under the piece of rock in my hand and hit it with the flint. but im afraid i might just slice the heck out of my hand.im gonna give it a rest for tonight. think on it. see what i come up with. i got spark. i just need to make it get to the charcloth fast enough to work.Tony