Return to previous post [Leer en Español] Ringwoodite blue crystal ~ 150 micrometers wide. Microphotograph taken at the University of Hawaii of a specimen grown in Bayreuth, Germany. Author: Joseph Smyth . Header image: The blue ringwoodite material. Steve Jacobsen, 2014. Ringwoodite is the most common mineral phase in the lower transition zone of the … Continue reading Water into the depths of the Earth