Structural and Magnetic Phase Transitions in Minerals

1. Toward a Thermodynamic Understanding of Feldspars: Order Parameters of Na-Feldspar and the I?-P? Phase Transition in Anorthite.- 2. Incommensurate Phase Transitions in Quartz and Berlinite.- 3. Phase Separation in Quadrilateral Pyroxenes and Olivines.- 4. Multicritical Phase Relations in Minerals.- 5. Equation of State and Possible Critical Phase Transitions in MgSiO3 Perovskite at Lower-Mantle Conditions.- 6. High-Spin to Low-Spin Transition of Iron(II) Oxides at High Pressures: Possible Effects on the Physics and Chemistry of the Lower Mantle.- 7. Molecular Dynamics Studies of Polymorphism of SiO2 at High Pressures: A Possible New Cubic Polymorph with High Density.- 8. Charge Localization and Associated Crystallographic and Magnetic Phase Transitions in Ilvaite, a Mixed Valence Iron Silicate.- 9. Magnetic Phase Transitions in Silicate Minerals.- 10. Magnetic Phase Transition in Olivines M2SiO4 (M = Mn, Fe, Co, FexMn1?x).- 11. The Spin Glass State in Garnet Mixed Crystals: New Evidence from Neutron Scattering and Macroscopic Measurements.- 12. Polytypism and Equilibrium Phase Transitions: In Situ Observation of the Polytypic Phase Transition 2H-12R in PbI2.