Quantity: 1 - Scale of Hardness Rock Set with Diamond This is the traditional Mohs Scale with a small raw diamond included. There are ten number coded specimens measuring approximately 1 x 1 1/2 inches (except the diamond don't you wish!). The determination of the hardness of a mineral can be an important step toward its identification. Hardness is the resistance which the smooth surface of a mineral offers to being scratched. A diamond is the hardest of all substances and can only be scr
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