First terrestrial discovery of an extremely rare mineral called ringwoodite confirms theory about huge water ‘reservoirs’ 410 to 660 km beneath the surface of our planet, says a team of researchers led by Prof Graham Pearson from the University of Alberta, Canada. Top: monochrome image of USD 20 diamond taken under incident light, with the ringwoodite inclusion highlighted by a red square. Bottom: enlarged view of the area of the host...
