Mined on the fourth layer of the Seven Mounting Heavens of Celestia, this fine iron needs no alloy and shines with a silvery gleam. When forged into a weapon, it gives the wielder a +1 bonus on the confirmation roll for a critical hit. The market price modifier for such a weapon is +1,000 gp.
Solanian Truesteel has 25 hit points per inch of thickness and hardness 11.
Note: The description in the Book of Exalted Deeds incorrectly describes this as Solarian Truesteel. The fourth layer of the Seven Mounting Heavens of Celestia is Solania.
Source: Book of Exalted Deeds (Page 38), Arms and Equipment Guide (Page 14)