Major creation

Major creation is a conjuration spell that conjures an object that can be made of both plant and mineral materials.

Effect
As minor creation, except you can also create an object of mineral nature: stone, crystal, metal, etc. The duration of the created item varies with its relative hardness and rarity:
 * Vegetable matter : 2 hours/level
 * Stone, crystal, base metals: 1 hour/level
 * Precious metals: 20 minutes/level
 * Gems: 10 minutes/level
 * Mithral*: 2 rounds/level
 * Adamantine**: 1 round/level

* Includes similar rare metals. Items made of mithral are 50% lighter than similar items made of steel.

** Items made of adamantine weigh 75% as much as similar items made of steel. They are also harder and better capable of retaining an edge, so armor and shields provide 1 higher AC and weapons allow +1 on attack and damage rolls (although the items are not magical).