So sorry. My computer decided it was going to crash as I was trying to post this the first time. I just assumed it had failed. I restarted and made a new post today, with pics. So sorry.
Actually, I posted one about Roman Glass, so here are pics of these. (I'm a disaster, I know.)
Only a guess from the image.
Petrified wood would be heavy like stone. If is light weight and dense with no continuous grain. I'd go with buffalo horn as well.
