I try my best, granite how? And would it be all over translucent over half inch deep? Never saw translucent graniteYoy may be getting tired of me saying this,but that,s pretty,I like pretty rocks and you sure show some pretty rocks.I don,t know what you call that but I recall seeing something like that when I was a kid. In railroad ballast before they started using this danged crushed blue rock, I believe it,s crushed granite. No character,one rock looks like another.
It was found in a river that i find many wood fossils so im being cautious cause it could be wood alsoDetails of where you found it would be helpful. I think it looks like a piece of gneiss that's spent some time in a primordial river or lake. If gneiss doesn't have too much mica and has enough quartz it can be polished like that.