The role played by earth sciences in the scientific community has
changed considerably during this century. Since the revolutionary
discoveries of global processes such as plate tectonics, there has been
an increasing awareness of just how fundamental many of the mechanisms
which dominate in these processes depend on the physical properties of
the materials of which the earth is made. One of the prime objectives of
mineral sciences is now to understand and predict these properties in a
truly quantitative manner. The macroscopic properties which are of most
immediate interest in this context fall within the conventional
definitions of thermodynamics, magnetism, elasticity, dielectric
susceptibilities, conductivity etc. These properties reflect the
microscopic contributions, at an atomistic level, of harmonic and
anharmonic lattice vibrations, ionic and electronic transport as well as
a great variety of ordering and clustering phenomena. The advances made
by solid state physicists and chemists in defining the underlying
phenomena lnvolved in the thermal evolution of materials have stimulated
major new research initiatives within the Earth Sciences. Earth
Scientists have combined to form active groups within the wider
community of solid state and materials scientists working towards a
better understanding of those physical processes which govern not only
the behaviour of simple model compounds but also that of complex
materials like minerals. Concomitant with this change in direction has
come an increasing awareness of the need to use the typical working
tools of other disciplines.