The metal is Tsuretic Silver.
The alien ship is known as Naglfar…a name out of norse mythology. It is the name of Loki’s ship, made from the fingernails of dead men. The name was coined by Dr. Nicholas Moore. When the ship struck the mountains the shockwave killed thousands in the surrounding areas and the distrubance to natural weather patterns killed hundreds of thousands more in the following months. This was not an event to be forgotten, nor smoothed over with a golden name. The ship is Naglfar.
The ship itself has been largely scavenged apart over the decades. Large parts of the hull are now contained within Valhalla, where ODIN digs deeper into the workings of the once mighty vessel.
The city is known as Highgate.