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INFRARED EVIDENCE OF DIOCTAHEDRAL-TRIOCTAHEDRAL SITE OCCUPANCY IN PALYGORSKITE

¹ Université Cadi Ayyad, Faculté des Sciences Semlalia, Boulevard Prince Moulay Abdellah, BP S.15 Marrakech, Morocco
² Université de Poitiers, UMR 6532 CNRS ’HydrASA’, 40, Avenue du Recteur Pineau, F-86022 Poitiers Cedex, France

^* E-mail address of corresponding author: sabine.petit{at}hydrasa.univ-poitiers.fr

A Mg-rich palygorskite sample from phosphorite deposits of Ganntour (Morocco) with the structural formula Si₈(Mg_2.6Al_1.19Fe_0.33^III_0.88)Ca_0.056Na_0.024K_0.104O₂₀(OH)₂(OH₂)₄·4H₂O, was studied by FTIR spectroscopy. In both OH-stretching and OH-bending regions, there is evidence of dioctahedral Al₂OH, AlFeOH and trioctahedral Mg₃OH features, leading to a di-trioctahedral crystallochemical model of octahedral site occupancies in ribbons of Ganntour palygorskite.

This model, established through the IR spectroscopy study of a Mg-rich palygorskite, seems to be appropriate for many other palygorskites with lower Mg content in the octahedral sheet.

Key Words: Cation Distribution • FTIR Spectroscopy • Octahedral Occupancy • Palygorskite

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