(Solved): 7. The deepest diamond mines occur at a depth of about 600 meters, ii where the pressure within t ...

7. The deepest diamond mines occur at a depth of about 600 meters, ${}^{\text{ii }}$ where the pressure within the rock is up to approx. 250 bar. Diamonds are formed very deep within the earth, $150\mathrm{km}$ to more than $600\mathrm{km}$, then transported up to shallow locations by convective movements and eruptions out of the mantle. ${}^{\text{ii }}$ How does the phase diagram for carbon show that the pressure is not high enough in diamond mines for the diamonds to have formed ther 8. A diamond ring caught in the intense heat of a house fire involving natural gas. When examined afterwards, some of the diamond had turned black. Does the phase diagram of carbon shed any light on what happened to the diamond?