Mithril, true silver. 1 Mithril Piece = 500 Gold Pieces. Sometimes called Elfin steel. This is the best metal for holding magic. It is not terribly strong, unless magically reinforced, nor can it hold an edge well. More often found in magic items or distributed armour like chain mail.
Adamantine, true iron. 1 Adamantine Piece = 2000 Gold Pieces. This metal is super strong, excellent rigidity and holds an edge well. It is pretty good at holding magic. Highly sought after for making weapons and rigid armour.
Tinium, true tin. 1 Tinium Piece = 20 Gold Pieces. This metal is super light but not terribly strong. It cannot hold magic at all but is an excellent channeler of magical energy. This is known for its novelty value. The process for its manufacture or synthesis is unknown but ancient worked pieces can be found in foil, wire, bars, and struts.
Laen, true glass. 1 Laen piece = 40 Gold Pieces. This material is strong, but brittle. Magic behalves oddly with it, sometimes it is resistant, other times it can store it but only through suffering leakage. Glassteel is generally preferred as a construction material.
Aurum, true gold. 1 Aurum Piece = 1500 Gold Pieces. This is extremely rare and most pieces date from the Dwarven Building Period. It was believed to be use for large scale mercantile transactions between the seven dwarven cities.
Quaborum, true lead. 1 Quaborum Piece = 2 Gold Pieces. This substance retains the same general pliability and weight of the more mundane lead but it has twice the magic resistance. Although the refining process was known to the late Roman Empire the secret is generally lost to all but the dwarves of Dwarrowdale.
Metallica, true mercury. 1 Metallica Piece = 150 Gold Pieces. Sometimes known as "fixated mercury", metallica is general a liquid but, in the presence of a magical field can become rigid. An unfortunate side-effect of Metallica is that it disturbs mental processes in its presence and drives most creatures insane. The process of construction is not difficult but is seldom practiced.