A brief introduction to Ringwoodite 

Ringwoodite a polymorph of the more common olivine-forsterite. It was named in 1969 in honor of the Australian geochemist who initially predicted it's existence, Alfred E. Ringwood.  It's formed within the high pressures and temperatures of the mantle transition zone between 440-660 kilometers in depth. It has also been found within chondritic meteorites, where it is thought to be a product of shock metamorphism. It's crystal structure allows it to easily bind with hydroxides, with samples containing up to 2.6% water by weight. This is why Ringwoodite is thought to play an important role in Earth's deep water cycle.