Moroccan Orthoceras found at a sale

A little change up in our fossil collecting this week with this polished specimen found at a charity sale.

Close up of the squid fossil

Close up of the polished fossil sphere.

Collector: Jonsey

I know absolutely nothing about fossils or rocks, but I bought this in a local charity shop because it looked interesting and unusual. It weighs between five and six kilos, I photographed it next to a £1 coin to show the scale. I would be grateful if anyone could give me some information about it. i.e., is it granite or marble or neither?

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