Aurorum

Aurorum: This luminous steel gleams with varying hues of pink and indigo. An aurorum weapon, shield, or suit of armor that has been sundered can be reformed by bringing together its fragments (a full-round action). The broken pieces bond quickly and seamlessly, restoring the item to its previous state. The market price modifier for an aurorum weapon, shield, or suit of armor is +4,000 gp.
Aurorum has the same hit points per inch of thickness and hardness as regular steel.

Source: Book of Exalted Deeds