Stainless steel.
A knife is conductible as the blade is made of steel.
A Swiss army knife is made of stainless steel.
A steel knife can scratch minerals with a hardness lower than that of steel, such as gypsum, calcite, fluorite, and talc. Minerals like quartz, topaz, and corundum are harder than steel and cannot be easily scratched by a steel knife.
apatite with a steel knife feldspar with window glass
knife
pocket Knife i belive, that is the only knife she carries on her the knife she shows on her first episode and throws at the civil war re-enacters looks like a Cold Steel Kobun.
Diamond is the hardest mineral that can scratch a steel knife or window glass.
I doubt that you will be able to find a stainless steel knife block anywhere. Knife blocks are made of wood or plastic so that they cause minimal damage to a knife when inserting it in the block. A stainless steel knife block would not only be incredibly heavy, it would damage the knife blades whenever one was inserted or removed.
Copper. Copper has a hardness of 2.5-3 on the Mohs scale, while a steel knife generally has a hardness of around 5.5 - 6.5. This means that a steel knife can scratch copper, but a copper penny cannot scratch a steel knife.
The steel blade of a knife will hold a sharp cutting edge.
Cold steel