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Talc-Pyrophyllite group [abbr. Tlc-Prl ]

[ A6+ ][(OH)2|(Si2O5)2]

Trioctahedral
[ Fe2+3]: Minnesotaite
[ Mg2+3]: Talc
[ Ni2+3]: Willemseite
Dioctahedral
[ Fe3+2]: Ferripyrophyllite
[ Al3+2]: Pyrophyllite
[ (Na,Al)2]Brinrobertsite