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Vanadium was incorporated into zircon by heating in air and in controlled atmospheres of oxygen. It was found that V"' could not be incorporated into zircon by firing in a hydrogen atmosphere. Comparison of the absorption spectrum of V"' in YPO, with that of blue zircons prepared in air and oxygen atmospheres, with and without fluoride additives, showed that it is highly probable that V'' is solely responsible for the color of the pigment. Crystal field analysis confirmed the existence of V" in the ZrOy position in the zircon structure,

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