Rock Identification?

[wonderd]

Hey everyone. Does anyone know what kind of rock this is? I was thinking it looks like lava or something.

 

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[MartyRocks]

My 1st (joking) inclination is that it looks like petrified dog poop.

To help you out... you need to help the members of the forum. So....
try to take the picture in natural (sun) light so no flash is required.

Take pictures from both sides... top and bottom. (I'm curious why the bottom is so flat.)

And maybe chip off a small piece and take a picture where it broke off, so to see a fresh
view of the big rock. And of course, do a streak test.

 

[DDancer]

As said some better pictures. At a glance it looks like obsidian or cast off slag.

 

[hvacker]

I wonder is it metallic? Can you file it? I don't see any blow holes associated with slag. I might have missed them.
It's very curious.