Hardness of rocks

Here are some interesting links to continue to learn about rock hardness:

https://www.youtube.com/watch?v=Y69eAhcT9x0&index=1&list=PL3e_JoJs8tocFYAlYRs3amFIjKp8nP_6O

http://money.cnn.com/video/pf/2013/08/02/pf-latt-diamonds-cut-from-rocks.cnnmoney/

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