Previously Unknown Mineralogy Of The Deep Earth Revealed
At shallow depths, minerals with similar crystal structures often merge to become individual minerals, usually in a high-temperature environment. Despite the structural similarity, however, existing studies have shown that calcium-rich davemaoite and magnesium-rich bridgmaonite remain distinct throughout the lower mantle. “Why don’t davemaoite and bridgmanite merge into one, despite having very similar atomic-scale structures?” Sang-Heon Dan Shim, co-author of the Nature paper, said in a media statement. “Many attempts have been made to find conditions where these two minerals merge, but the answer from experiments has consistently been two separate minerals....