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Pietra fosforica di Bologna

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When heated it becomes phosphorescent
Italian synonym of:
It is a variety of barite found in nodular-fibrous or radial formations or concrections on the hills around Bologna (Emilia-Romagna) Italy, with the “argille scagliose” formation. After heating with reducing substances (as coal) it becomes phosphorescent (because of impurities but probably due to the formation of barium sulphide).

The English name is Bologna stone.

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Camillo GALVANI. “Della pietra fosforica Bolognese” - Bologna: Stamperia del Longhi (1780)

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