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... 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.

These numbers show that the sharpness of the O ...

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