Reliable characterization of the properties of amphibole end-members is a prerequisite for many important things in mineralogy and petrology, especially for the calculation of phase equilibria that involve amphiboles. Laboratory measurements of the thermochemical and thermophysical properties of amphibole end-members, as well as the experimental reversal of critical reactions, require the availability of adequate amounts of appropriately pure samples. More often than not, nature fails to provide material that fulfills the chemical and physical requirements of phase purity. Synthesis of chosen compositions at high pressure and temperature might seem to be the obvious answer to the problem, but it is...
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