Whiterock

Whiterock is a mysterious, slick, seamless white stone that is immutable and indestructible. Its origin is unknown. It appears only in ancient relics that predate all recorded kin history, and is often imbued with specific powerful magic. It is implied that a great, ancient civilization understood how to manipulate whiterock, but that secret has long since been lost. Some of the greatest wonders of the world are made entirely of whiterock. Such as:
 * The Spire of Cloudport: a thin whiterock tower, over 110 stories tall, with an impossibly thin flared platform on top, like the horn of a trumpet flattened from the front.
 * The Snow Anchor: a massive whiterock ship's anchor, taller than a tower, found in the middle of a field, far from the nearest sea.