Found this in a creek in south carolina

[Samrocks1]

I need help getting pointed in the right direction. I found this stone in a creek behind my house the other day. I am not sure what it is. I have been suspecting green garnet but it's hard to tell. I need some opinions. Someone told me it was lave glass but I find that rather unlikely seeing is there's no volcanic activity in south carolina. Someone else said that it could be glass slag but I don't know how it could get here where I live. There are no smelters or bottle factories close by. Plus it feels like a stone and not glass. It was a whole piece and it weighed 120gs. I seperated it to better see what it looked like. When it split it seemed to split in a layered manner. Now I have 2 big chunks and some pieces. Here's what I know about it. It has a hardness between 6.5 and 7. It is magnetic, It seems to be single refractive. I'm not 100 percent sure but I think I see where it began to form. It seems like it is calcium aluminum silicate in the center with iron traces leading into the green. But I'm no chemist. Just seems to be what I've noticed since I started reading and looking at pictures.when it was whole it felt like a rough big heavy stone. Anyways I would like to figure out what it is. I don't believe it is glass. I can drop it on the floor and it just bounces with a loud thud. It looks like a snake head when it was whole. So let's say for instance it's a snake head. Well down at the tip of the where the mouth would be that's where the big patch of what I believe calcium aluminum silitate and then it looks like a grow pattern following up with the red and brownish hues into the vivid green. Someone please confirm or deny my beliefs ad maybe point me in the right direction

 

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[Tedyoh]

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[Samrocks1]

I didn't realize this was more of a metal hunting site. I'm gonna try and take it around Monday and see who can help me. I know that some museums will can identify it and I know some universities will also. There is a lapidary place about 45 mins away so hopefully I can come up with somrthin

 

[Samrocks1]

Polished a piece of it up a bit. It disperses light magnificently. This is a 500 lumen flashlight

 

[Samrocks1]

Does glass make sparks when your cleaning it with a wire wheel?

 

[fowledup]

Looks like Jade