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Clays and Clay Minerals; April 2003; v. 51; no. 2; p. 121-132; DOI: 10.1346/CCMN.2003.0510201
© 2003 Clay Minerals Society
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A CRYSTAL-CHEMICAL STUDY OF NATURAL AND SYNTHETIC ANIONIC CLAYS

Cristina de la Calle1, Charles-Henri Pons1, Jacques Roux1 and Vicente Rives2

1 ISTO, UMR 6113, CNRS-Université d’Orléans, 1A Rue de la Ferollerie, 45071 Orleans Cedex 2, France,
2 Departamento de Química Inorgánica, Universidad de Salamanca, 37008 Salamanca, Spain

* E-mail address of corresponding author: charles-henri.pons{at}univ-orleans.fr

A comparative crystallochemical study was performed on natural and synthetic hydrotalcite-like compounds with similar compositions. The nature of the brucite-like sheet stacking was addressed by means of powder X-ray diffraction. From the resulting electron diffraction patterns it was possible to establish the order-disorder of the cations in the brucite-like sheet. The results show that a natural sample from Snarum is an intergrowth of hydrotalcite (3R1 polytype) and manasseite (2H1 polytype) at a ratio of 77:23 (wt.%). An aluminian serpentine is associated with the hydrotalcite and manasseite minerals. The structure of a synthetic sample, Mg:Al = 2:1, was determined as space group Rm. For a few crystals in this sample, the octahedral cation distribution is compatible with the observed supercell (a = a' {surd}3). A second synthetic sample showed the presence of stacking faults and was described as a random layer sequence of two polytypes (3R and 2H).

Key Words: Anionic Clays • Crystal Structure • Hydrotalcite-like Group • Polytype • Snarum • Stacking Faults • Synthetic Double Hydroxides • X-ray Diffraction






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