Creek hunt and what type of stone is this?

[rock]

I went back to the creek seeing the water is low now. I found some more of the debitage of the white stone and a core of it. I showed some of the debitage pieces last week to a customer that comes in and he is a retired Geologist. He studied the piece and says well it is not from the local area we live in (north Ga) so it must of been traded in. Which by the way to me is cool to know. Anyway he then guessed it to be "moonstone". Today I went back and found some more of it and one piece that looks to be a small knife. This type of rock looks like slag but it has been worked and I have found plenty of flakes of it. The last piece was found in another creek also today and is missing the tip (darn-it).

 

[rock]

Let me put this last piece next to yours so we can compare.

 

[rock]

@ GB the dry pics came out blurry.