Unfortunately I think that's just a piece of glass, I could be wrong but I'm pretty sure that's what you have, I find creek tumbled glass every now and again when I prospect for gold.
Steve.
It looks like a piece of melted glass to me but hopefully I'm wrong and it is something rare and wonderful. If it is glass, don't feel bad about asking. I once asked "what is it" to this group on a piece of aquarium gravel.
Just a few years ago before I started to study up on rocks and minerals I thought a piece of that coca cola green blue glass creek tumbled was a gemstone I took it into a jewelry store to see if anyone could tell me what it was and right away they said its glass. The bubbles in her piece gave it away for me.
Looks like mostly quartz or variations thereof, third from last looks like either smokey quartz or quarts with a manganese coating on it. 2nd from last looks like quartz with possibly a chlorite coating on it, hard to tell from pics.
I have a bunch of naturally tumbled quartz and Topaz from N. Carolina. I’m thinking it is probably quartz as well, but the yellowish toning in it makes me lean more towards Topaz as most samples I have have a streak or blob of yellow toning. A hardness test will confirm it for you.