1. Physical methods used to determine the geological origin of amber and other fossil resins; some critical remarks

   • Sviatoslav S. Savkevich

   OriginalPaper Pages: 1 - 4

2. Dislocation substructures of grain boundaries on splitting surfaces of quartz rocks

   • V. G. Balakirev

   OriginalPaper Pages: 5 - 9

3. Electron relaxation in deerite

   • H. Pollak
   • R. Quartier
   • W. Bruyneel

   OriginalPaper Pages: 10 - 14

4. Structures and cohesive properties of hydroxides and fluorides calculated using the modified electron gas ionic model

   • J. A. Tossell

   OriginalPaper Pages: 15 - 19

5. The lattice energy of forsterite. Charge distribution and formation enthalpy of the SiO ₄ ⁴⁻ ion

   • Michele Catti

   OriginalPaper Pages: 20 - 25

6. Vibrational spectrum of fresnoite (Ba₂TiOSi₂O₇) and isostructural compounds

   • M. Gabelica-Robert
   • P. Tarte

   OriginalPaper Pages: 26 - 30

7. A room-temperature phase transition in maximum microcline. Absorption in the far infrared (10–200 cm⁻¹) in the temperature range 110–300 K

   • B. Wyncke
   • P. F. McMillan
   • F. Bréhat

   OriginalPaper Pages: 31 - 34

8. A potential model for fluorapatite

   • V. Devarajan
   • W. E. Klee

   OriginalPaper Pages: 35 - 42

9. Thermodynamic properties of the forsterite-fayalite (Mg₂SiO₄-Fe₂SiO₄) solid solution. determination of heat of formation

   • P. Thierry
   • C. Chatillon-Colinet
   • J. Amossé

   OriginalPaper Pages: 43 - 46

10. Application of lattice imagery to radiation damage investigation in natural zircon

    • Keiji Yada
    • Takayoshi Tanji
    • Ichiro Sunagawa

    OriginalPaper Pages: 47 - 52

11. Optical theory of asterism

    • A. Wüthrich
    • M. Weibel

    OriginalPaper Pages: 53 - 54

12. IMA-news

    News Pages: 55 - 55