Metalogue

The Metalogue (メタログ Metarogu) is a book written by an unknown Knightwalker, and lists all known types of metals.

Adamantine
Adamantine (アダマンタイン Adamantain)

Mythril
Mythril (ミスリル Misuriru)

Orichalcum
Orichalcum (オリハルコン Oriharukon)