Mississippi River, Louisiana, found mud larking
Hey folks: I'm trying to write this out so it's easy to read. I'm trying to go through all my little treasures and label them. This one is confusing me, and I was hoping someone could help?
I often dig in the tide garbage to find forgotten treasures. I thought this was "pirate glass", or 18th century piece of broken rum bottle, because that's what I usually find. But when I got it home, it looked almost metallic. I know it's not metal though.
It was covered in mud/garbage. The white and yellow are surface bits I couldn't successfully clean off. It originally had a lot more around it, like it had been calcified, which is kinda common. There's none of the chalky bits inside.
No reaction to water (obviously).
No reaction to vinegar, not even the white chalky bits.
No reaction to lye.
Under bright light, it's partially translucent and looks brown.
Cannot be scratched with a steel knife but it can scratch glass.
Has a Geiger reading of 0.24 \mu Sv/hr.
No UV luminescence.
Thanks in advance.