A new carbonate phase calcium carbonate hemihydrate was recently discovered and characterized, but exclusively as a synthetic material. Here the authors find that it exists in nature, albeit transiently, on the surface of growing nacre and coral skeletons, and show that 2 amorphous and 2 metastable crystalline nano-minerals form before biominerals settle into their stable crystals.
- Connor A. Schmidt
- Eric Tambutté
- Pupa U.P.A. Gilbert
