Unique specimen is it a shell or a tooth or maybe bone fragment

[AfroRaptor]

I found this piece up fiddlers canyon last year and after simple cleaning I still have no idea what it is. I've seen nothing else like it in the fossil beds there. Fiddlers canyon is in the south west of Utah USA next to the rocky mnts. 

[Fossildude19]

Oyster shell bit.

[AfroRaptor]

But I did the acid test? It bubbled a little but it didint foam like the clay shell fragment I tested. And it's a different color from all the shells I've found including full oysters. 

[Fossildude19]

Does not look like bone or tooth to me. Seeing as you find oysters and gastropods in the area, ... makes sense that it is a bit of shell.  

 

[AfroRaptor]

1 hour ago, Fossildude19 said:

Does not look like bone or tooth to me. Seeing as you find oysters and gastropods in the area, ... makes sense that it is a bit of shell.  

 

Fair enough. 

[Ludwigia]

8 hours ago, AfroRaptor said:

But I did the acid test? It bubbled a little but it didint foam like the clay shell fragment I tested. And it's a different color from all the shells I've found including full oysters. 

Shells react differently depending on their chemical stability. Some bubble away like crazy and others hardly react, even though they are basically made up of the same substance. This is probably from a different species or even family than the other one you tested or the circumstances of their preservation were different.

[AfroRaptor]

1 hour ago, Ludwigia said:

Shells react differently depending on their chemical stability. Some bubble away like crazy and others hardly react, even though they are basically made up of the same substance. This is probably from a different species or even family than the other one you tested or the circumstances of their preservation were different.

Interesting. Then is there no tests to make certain what it is?

[Ludwigia]

29 minutes ago, AfroRaptor said:

Interesting. Then is there no tests to make certain what it is?

Whether it bubbles a lot or a little is irrelevant. Either way you have calcite or a mineral which dissolves in acid, in this case more than likely calcite, since this is a piece of shell.