Any Idea?

[Hmmm?]

Tempted to try to clean the top of this, to see what has caused the rusting..
Any idea what kind of rock?

 

[Arid-Zone-A-seeker]

Did you find it on the beach?

 

[Hmmm?]

Good morning Arid..

Yes, I found it on the beach. It's pretty heavy, for a small object.

 

[Eu_citzen]

Why not break up a small corner or something to see a fresh surface? Could be a quart related rock. Reddish stains could be due to hematite.

 

[Hmmm?]

I'll give it a try Eu...

Thank you for taking a look.

 

[Grundestoun]

Could it be a petrified shell?