Also called Silvertine by Men, and Celebdil by the Elves.

Midway along the Misty Mountains stood the peak of Zirak-zigil, one of the three great mountains beneath which the Dwarf kingdom of Khazad-dûm was delved.

Within the pinnacle of Zirak-zigil, at the top of the Endless Stair, was the chamber called Durins Tower. It was here in TA 3019 that Gandalf battled with the Balrog of Moria. In the Battle of the Peak, the Endless Stair and Durins Tower were destroyed. From that great height Gandalf overcame the Balrog and cast him down into the abyss below.
Encyclopedia entry originally written by High_King_Of_Gondor