1. Application of magnetic circular dichroism spectroscopy to the optical spectra of natural and irradiated diamonds

   • I. N. Douglas
   • W. A. Runciman

   OriginalPaper Pages: 129 - 136

2. Mechanical twinning in diopside Ca(Mg,Fe)Si₂O₆: Structural mechanism and associated crystal defects

   • Stephen H. Kirby
   • John M. Christie

   OriginalPaper Pages: 137 - 163

3. Electron paramagnetic resonance, optical absorption, and magnetic circular dichroism studies of the CO ₃ ⁻ molecular-ion in irradiated natural beryl

   • A. Edgar
   • E. R. Vance

   OriginalPaper Pages: 165 - 178

4. High temperature elasticity of rutile-structure MgF₂

   • Leonie E. A. Jones

   OriginalPaper Pages: 179 - 197

5. The superstructure of plagioclase feldspars

   • Masao Kitamura
   • Nobuo Morimoto

   OriginalPaper Pages: 199 - 212

6. The superstructure of plagioclase feldspars

   • Yoshiharu Nakajima
   • Nobuo Morimoto
   • Masao Kitamura

   OriginalPaper Pages: 213 - 225

7. Dynamic character of the primitive to body-centered phase transition in anorthite

   • F. Frey
   • H. Jagodzinski
   • W. B. Yelon

   OriginalPaper Pages: 227 - 231

8. Editorial

   EditorialNotes Pages: i - i