Calcite shell?

[MrBones]

Hello everyone!

I haven't posted here in a long while, mostly due to lack of finds.

I dug this out of my collection, and wondered what it could be. It looked like some form of calcite, but has an oddly organic shape. I also noticed that it has some small fossils, possibly shells, attached to the bottom. 

It came from Al Ain, United Arab Emirates, near the foot of Jebel Hafeet. I am not sure of the age, but I assume it is Miocene. I have found many numulites close to the location, as well as gastropod steinkerns, and urchins.

 

[MrBones]

Here are some more pictures to help show the shape. The backside is completely flat.

[Lone Hunter]

Looks like calcite, did you try the vinegar test to see if it fizzes? Interesting fossil on the end so hope someone can ID it.

[MrBones]

7 minutes ago, Lone Hunter said:

Looks like calcite, did you try the vinegar test to see if it fizzes? Interesting fossil on the end so hope someone can ID it.

Thanks, me too! Yes, it does fizz.