There Earth’s crust is divided into two categories, continental and oceanic. Although thinner, the Oceanic Crust is denser at 3.0 grams per cubic centimeter compared to the Continental crust which is 2.7 grams per cubic centimeter. However, determining the hardness can be difficult, because the composition of rocks can very greatly in the same location. Primarily oceanic crust is made from basalt which contains high levels of iron. On Mohs Scale of Hardness Iron receives a 4 out of 10 (1 being the softest and 10 being the hardest). Much of the continental crust is composed of granite, which receives a 7.5-8.0. So, while oceanic crust may be denser, continental crust contains harder rock.
Narrowing this down further can be difficult, but something to consider is that Diamonds are considered the hardest mineral, so diamond mines could in fact be considered some of the hardest parts of the Earth’s Crust: literally, politically and environmentally.
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