So you've got Adamantium. Now what ?

. . . Adamanteen?

Yeah, I know, but mine is better.

And we’re done.

Wouldn’t it just fly off into space?

I vote for a +5 holy avenger. You can only make +5 weapons from adamantium.

Yes, and you can use it to launch the space elevator.

I’d like a space elevator… but how about a vacuum train in a subsurface orbital tunnel?
Would we have enough adamantium to line the inside of the tunnel with an impervious and frictionless surface?
And could we hamdance down the tunnel fast enough?

Doesn’t seem like it, unless the stuff isn’t made from atoms. Suppose again that we have 250 cm^3 of the stuff, and also that we can thin it down to 1 nm. We then have 250,000 m^2 of plate. But that’s not nearly enough for a nice vacuum tunnel; even a modest freight tunnel of 100 km and 1 m diameter would need more than that, and a nice tunnel of 10,000 km and 10 m diameter would need about 1200 times more material.

He won’t follow fashion. That would be a joke.

Okay; just mold it into a ball with a hole big enough to pass a mini-nuke, and pop a new one in every few seconds, like a Project Orion boom-ship.

Damn; this stuff would be really useful for rocket propulsion; one big problem is the high temperature of the rocket motor. A really powerful rocket would just melt or vaporise. There would be no such problem with magical adamantium.

Ball Bearings.
Indestructable, Undeformable, Ball Bearings.
I wins da Interwebs. 'Cause a little thing like that would make one Hell of an impact.