World's Oldest Rock?

That is all interesting and mostly true. This is just a minor point, but a rock is not a single grain that is made of one mineral like zircon. That picture is of a grain of the mineral zircon. The rock that it was found in is probably not 4.4 billion years old; the zircon grain is. In order for the rock to be that old, it would have to be totally of an igneous nature. In all likelihood, the rock is a metasedimentary rock that first incorporated the zircon in a sedimentary layer and later underwent metamorphism to produce the rock we see today. If there is an igneous intrusion in the hill that the rock was found in, we can have an idea when the metamorphism took place that actually produced the rock they found.

Sunburst consulting? No. It looks like a nice place to work however. Do you know if they have internship positions available over the summer? I am looking for one. I have 3 semesters left before I earn by bachelors degree in geology.