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Question:

Can the granite be carved with a knife?

Can the granite be carved with a knife?

Answer:

If it is hard to do with the steel knife (hardness close to 7) engraved on the granite when engraved in the quartz is often also difficult to carve traces, but engraved on the feldspar, mica can be engraved on the traces. If it is made of high-quality tool steel knife (hardness of 8 or more) engraved in the granite above, engraved in quartz, feldspar, mica can be engraved on the traces.
The main component of the knife is steel, the hardness of iron is 5, but the manufacture of knife is steel, hardness is higher than iron, with quenching or nitriding treatment, hardness is often more than 6, the highest hardness can reach more than 8. If you are using ordinary cut pencil with a knife (ordinary iron, hardness of 5) engraved in the granite above, engraved on the quartz and feldspar can not be engraved traces, but engraved on the mica can be engraved traces.
Granite is the main component of feldspar, quartz and mica. Feldspar hardness is 6-6.5, quartz hardness is 7, mica hardness is generally in the 2 to 3.5.

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