Abstract
The flux growth of emerald crystals by slow cooling in the PbO · V2O5 flux is reported. The crystals exhibited the typical emerald-green colour, were up to 1.8 mm in size and transparent. Their form was a regular hexagonal rod bounded by the well-developed {0001} and {10¯10} faces. The solubility of emerald in PbO · V2O5 was also investigated; about 9.0 g emerald was dissolved in 100 g PbO · V2O5 at 1200 °C. The solubility decreased gradually with decreasing temperature. Taking the solubility data into account, the presence of undissolved particles in the solution was found to be a necessary condition for the growth of large emerald crystals. Unsaturated solution at a soak temperature produced good and relatively small emerald crystals in a subsequent cooling experiment. Advantages of the PbO · V2O5 flux are also mentioned. Emerald crystals showing various kinds of imperfections, and even good crystals, were also present.
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