Need help identifying

[WNCsweeper]

I was digging a pond in western North Carolina and found this can anybody identify it's like white quartz but more like volcanic glass with a crustacean

 

[WNCsweeper]

 

[Eu_citzen]

My hunch tells me it might be man-made something?

 

[Mrdigz]

Kinda hard to identify
Could be a mold for glass, part of a toilet bowl. Or very large serving bowl. Hopefully it wasn't both!! Haha.
Maybe some different pictures in different lighting will help.

 

[DDancer]

Closer pictures would help as well as an estimate on hardness. It has aspects of being man made but I kinda doubt it as its not uniform enough and does not appear to be slag either. Not really glass and not an artificial granite.

 

[Mrdigz]

Maybe a chunk of Marble that just been worn down over the years?

 

[DDancer]

Off hand its a good guess Mrdigz. Bit sharp edged but there are some very fine granites that look like that. Looks to be closer to a chalcedony or opal if its natural. Wonder if there will be any follow on.