The Pineal Gland, asymmetrical crystals in the pineal gland that are ‘piezo-electric'

[jan]

Thx for the link.

So this is indeed a replacement in the crystal structure by fluoride in an already calcified pineal gland:

[...]The extremely high level of substitution in the crystal structure of pineal HA by fluoride illustrates the readiness with which fluoride replaces the hydroxyl ion in the HA crystal. By old age, pineal HA has a higher fluoride content than other biological apatites.