Australian geologists summoned the hunt for precious minerals in Antartic say they have for the first time discovered the deposits of the igneous rock that yields diamonds.Here's Matt McGrath.
The third type of rock are the metamorphics, and the metamorphics can either be sedimentary or igneous rocks that have been changed by heat and pressure deep underground.
And as it turned out, these were igneous rocks, which was of surprise to us, but a really pleasant surprise because igneous rocks contain different kinds of information that we're interested in for return sample science.