Delessite

Fe-bearing variety of clinochlore (some references also consider it a Mg-rich variety of chamosite).

Chemical context

Stoichiometric formulas

Delessite
mindat.org
  • March 13, 2023(Mg,Fe,Fe,Al)(Si,Al)4O10(O,OH)8
mineralogy.rocks
  • Aug. 30, 2022(Mg,Fe2+)5(Fe3+,Al)(Si,Al)4O10(O,OH)8