Stonecutter
PeTe 15, including unlimited uses
R:Touch D:Inst T:Part
This simple but sturdy bronze-hilted dagger can cut through solid stone (but not gemstone) as if it were soft clay.
Note that the knife's magic only weakens the stone, the blade does the job of cutting through it.
Base 2+1 [weaken stone], +1 Touch, +1 Part, +10 levels Unlimited uses.
Bronze grants a +3 S&M bonus to Terram enchantments (a dagger would also grant +2 to precise destruction)