Whetstone

Whetstone
Creation

Activate stone chisel Right-click rock shards (0.33 kg) Open submenu "Create > Tools"
Result
Whetstone (0.30 kg)
Skill and improvement
Uses stone cutting skill Cannot be improved

Description

A small finely polished stone used for sharpening the edges of weapons.

Whetstones decay very rapidly so they should always be stored in inventory.
They cannot be repaired (though damage can be removed from them with the help of the spell Mend.
Max quality of the finished whetstone is determined by the quality of the rock shard used. Try to use as high quality a shard as possible, however it's no big loss to just make a new one later on as they need very little source material.
.03kg of material is lost on a failed creation attempt.