This feels like porcelain or ceramic and has a high pitch sound when I tap it on something. I don’t have a photo of the cross section at the moment, but I’ll take one when I can. The cross section is a perfect circle with a small hole in the center.
To confirm ivory, you would need to sand and polish the end with the hole. If it's ivory, there will be fine criss-cross lines visible. Another test would be to take a straight pin and heat it. Touch the hot pin to the object and smell it. Obviously ceramic will not react but antler or ivory will have a burnt hair smell. Gary
I confirmed it’s not ceramic. It’s been altered by Indians or whomever inhabited my land a long time ago. I looked at the end with the hole under my 30x loupe and you can see a cross cross checkered pattern, it’s a very tight pattern. I will polish the end with my Dremel and post photos of it