Ha, got you! This is nothing about magic - or is the properties of these materials magical in themselves? Bascially, the crafting system got me thinking about what things are made out of.
Currently we have:
1) glass 2) iron 3) gold
4) silver 5) copper 6) zinc
7) cromium
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tungsten 9) carbon
10) coal 11) basalt 12) silica
13) diamond 14) plastic 15) tin
16) leather 17) hair 18) wool
19) wood 20) magic-wood
with 0 being "base material".
But if we go in depth with the crafting system, why not go indepth with some materials things can be made out of - and perhaps get benefits for being made out of it. For example, what if someone found a mine of mithril (is that really a material you can mine? I assume it is as you can make armour out of it - dang it, she's got me spelling armor with a u now) way off in never-never land. why wouldn't they be able to forge it into armor (or have someone forge it for them). Below are some ideas (ripped off a D&D wiki website) with the basic benefits (if you're talking D&D) to having the item made out of said material. Note, some things can not be made out of some of these materials - ie: a wooden staff can not be made out of Adamantine as that is a metal, but it can be made out of darkwood. Note 2, some of these I've not even heard of as they were scavaged from various sources - not that I don't have the sources, I just haven't paid enough attention to them.
Adamantine - DR, improved sundering
Darkwood - ½ normal weight of wood
Dragonhide - can make metal armors that count as hide
Cold Iron - 2x heavy has bane to magical creatures
Mithral - Makes armors that weigh ½ as much, and count as a lighter type
Alchemical Silver - maintains weapon, and bane to lycanthropes
Pandemonic Silver - causes scream that makes others cower in strong winds
Thinaun - traps soul of those slain by it
Baatorian Steel - +1 to damage on slashing and piercing
Baatorian Greensteel - Counts as Wounding if magically enchanted
Morghuth Iron - -1 attack, but poisons opponent
Truesteel - +1 on roll to confirm critical hits
Dendritic - armor made of growing crystal
Astral Driftmetal - 25% chance of working against incorporeal creatures
Blended Quartz - -20% arcane failure rate
Bronzewood - wood that can be made into plate armor and weighs 10% less
Chitin - plate armor made from insect exoskeletons
Darkleaf - special worked Darkwood made into light plate armor
Elukian Clay - removes weight penalty for swim checks
Entropium - +2 max dex -10% arcane failure, +2 AC penalty and added weight.
Urdukar - +2 DC on scry attempts per 5 lbs carried
Aururum - Pieces meld back together if broken
Frystalline - Good aligned
Serren - Branch wood that has ghost touch
Green Starmetal - Adamantine that deals 1d6 extra damage to outsiders.
Blue Ice - +1 damage slashing weapons, Mythrial type armor but cold as ice
Rimfire Ice - Glows like torch, +1 cold damage, explodes 1d6 cold damage
Stygian Ice - deals wisdom than consitution damage
Pearl Steel - functions better underwater than normal weapons
Riverine - ½ AC becomes deflection bonus, provides force affect
Abyssal Bloodiron - Cold Iron, +4 Critical Confirm
Just ideas and thoughts to keep the brain working.
Kvetch