The existence of two types of protons in beryl was proved by the proton magnetic resonance technique; one is as a molecular form of water in the channel of the crystal, while the other is as a hydroxyl-ion replacing O2− ion of the crystal lattice. The proton-proton line of the water was found to be parallel to the c-axis of the crystal.
No takes yet. Share an insight, caveat, or question.
Sugitani et al. (1966) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: