Pietra fosforica di Bologna

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Name:	When heated it becomes phosphorescent
Italian synonym of:	Baryte

It is a variety of barite found in nodular-fibrous or radial formations or concrections on the hills around Bologna (Emilia-Romagna) Italy, into “argille scagliose” formation. After heating with reducent substances (as coal) it becomes phosphorescent (because of impurities but probably for the formation of Ba Sulfide)

References for Pietra fosforica di Bologna
Reference List: - +	Camillo GALVANI. “Della pietra fosforica Bolognese” - Bologna: Stamperia del Longhi (1780)
Internet Links for Pietra fosforica di Bologna
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