Blue Bellerophon Gastropod/possible brachiopod

Found this one a long time ago and never posted it here, not sure what it belongs to but Pharkidontis has been found in nodules, any more specific IDs are welcome! Due to being contained in a phosphatic nodule, I believe the blue-grey hue comes from that as well. I have some conulariids of a similar hue so I assume it's a quirk of the fossilization process. I also have some other bellerophons of normal colorization in the same nodules. Found in a Muncie Creek Phosphatic Nodule.

Here is the other half with some fish remains:

The lower bone resembles braincase material, which can further support the idea this blue hue is caused by the fossilization/phosphate replacement process.