Five specimens of brannerite were examined by differential thermal analysis. The thermal curves indicate loss of water at relatively low temperatures and recrystallization above 550°C., accompanied by two exothermic reactions. Experiments involving preheating of brannerite from Cordoba, Spain, suggest that initial recrystallization is a three-stage process involving both loss and gain of energy. Thermal curves of brannerite are sufficiently different to distinguish material from various localities.

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