1. Infrared spectra of oxonium and ammonium ions in layer aluminosilicates

   • G. B. Bokij
   • D. K. Arkhipenko

   OriginalPaper Pages: 233 - 242

2. Thermal expansion coefficients for indialite, emerald, and beryl

   • John L. Schlenker
   • G. V. Gibbs
   • R. H. Myers

   OriginalPaper Pages: 243 - 255

3. The disproportionation of andalusite (Al₂SiO₅) to Al₂O₃ and SiO₂ under shock compression

   • H. Schneider
   • U. Hornemann

   OriginalPaper Pages: 257 - 264

4. Nonstoichiometry in sillimanite: Mullite compositions with sillimanite-type superstructures

   • W. E. Cameron

   OriginalPaper Pages: 265 - 272

5. Measurement of the polarized absorption spectra of synthetic transition metal-bearing silicate microcrystals in the spectral range 44,000-4,000 cm⁻¹

   • K. Langer
   • R. M. Abu-Eid

   OriginalPaper Pages: 273 - 299

6. Mössbauer spectra of kyanite, aquamarine, and cordierite showing intervalence charge transfer

   • Kathleen M. Parkin
   • Bruce M. Loeffler
   • Roger G. Burns

   OriginalPaper Pages: 301 - 311

7. An electron microscopic study of some twinning and exsolution textures in microcline amazonites

   • J. E. Tibballs
   • A. Olsen

   OriginalPaper Pages: 313 - 324