Seeing this, Xiulote became somewhat irritated. He paced back and forth with his hands behind his back, deep in thought.
"Mohs scale of hardness…"
The Mohs hardness is a measure of one object's ability to scratch another and more so reflects sharpness. Obsidian Stone's Mohs hardness ranges from 5.2 to 6.2 and is a natural glass but prone to shattering. Copper has a Mohs hardness of only 3, while bronze ranges from 5 to 6. Iron has a Mohs hardness of 4, carbon steel at 5.5 to 6, and manganese steel reaches 6.5.
