As in a centrifuge, the heavy minerals, including the diamonds, sink, while lighter minerals are floated off to be deposited in waste pits.

Essentially what you need is lighter minerals forming the continental crust float that oceanic crust lacks.

Spurrite is a white, yellow or light blue mineral with monoclinic crystals.

The rest was lighter minerals.

It is a light grey mineral with Mohs hardness of 5.

This heating allowed heavier material to sink to Vesta's center and lighter minerals to rise to the surface.

Adelite is a mineral that can be blueish-gray, green, gray, yellow, or light green in color and is made of crystals.

Over time, seismic activity and volcanic eruptions spewed lighter minerals onto the surface, where they combined with a newly formed atmosphere to form the earth's crust.

Continents require billions of years of tectonic movement to distill the lighter minerals to the surface.

The top layer, which contains the lighter minerals, can be removed from the bottom layer, which contains the heavier minerals.