Fossil identification

[otisalex.01]

Need help identifying this. Im pretty sure its a dinosaur egg. Any suggestions would be appreciated. 

[otisalex.01]

More photos

[Kane]

My guess would be septarian nodule or similar concretion.

 

You may find these guides helpful: 

 

[Tidgy's Dad]

Looks like a septarian nodule to me.

[thelivingdead531]

I’m going with septarian nodule as well. 

[otisalex.01]

So what should I do with it? Keep it as is or break it open?

[otisalex.01]

Are they always so big and heavy?

[Creek - Don]

That is a nice big Septarian Nodule.   I found a smaller one about 6 inches wide. 

 

 

Here is what mine looked when cracked open. 

 

[Tidgy's Dad]

No, they can be just a couple of centimetres or up to three metres or so. 

It's up to you if you want to keep it or not or break it open. 

The insides can sometimes be very pretty when cut and polished.

 

[Bob Saunders]

The Septarian nodules we find in a limited area here is clay that  has hardened into Siderite cracks filled in with calcite. To break one open it will likely come apart in several chunks so I would cut it or leave it whole. I wet wheel grind them and then wet sand the marks out smooth then wheel polish with ZAM.  yours will not likely have calcite in it and not considered the same type.