I don't think this is bone, it looks like part of a sea shell to me; the hinge area of a bivalve. Try cross posting on the Sea shore discussion group and see if anyone can be more precise
Thank you, John. I was out of my league I guess...not a spongy bone but something riddled by a boring sponge, most likely. I am still curious about what type of shell it would be, it is odd where it has the flat area and the channel in the purple area. So! Thank you again, very helpful!
I see what you mean, John, about bivalve hinge.
Brachiopods also have hinges, but there are far fewer species especially of this size.
In some shells, perforations are primary (punctae), secondary (pseudo-punctae, where calcite rods have been dissolved), but the perforations may also be tertiary (formed by boring organisms). I am not sure which we are seeing in your specimen, but I do think it includes tertiary perforation.
Still, I don't really recognize it.
Thank you Mike. I did some looking around the internet re: brachiopods. What had me puzzled was that channel in the flat purple part. But then I found some pictures of brachiopod brachidium, which look similar to the channe in my object. My picture might not show the coils very well but they are pretty distinct. I think you are on the right track...even though this isn't a bone I thank everyone for their help!
This thread is currently being continued on the Seashore board.
Please post there instead of here.
...Unless we decide it really is a bone!