What is on the outside?

[Hdijk]

Hi,

I found this in Norway a couple of years ago, at the base of the Odda glacier. Does anybody know what the outside layer is? It looks like the bottem and sides were covered to at some point. It weighs about 1.8 kg 12x8x8 cm. Some insight would be greatly appreciated

 

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[old digger]

It kind of resembles a piece of lava landed on a rock.

 

[Kray Gelder]

Looks like a piece of granite dike in black basalt. Like this pic.