Cristaux très fluorescents dont l'éclat éclaire la base, la rendant visible sur la photo. Activateur inconnu. Large, thick crystals that exhibit a very strong white fluorescence. So strong in fact, that they light the surrounding matrix sufficiently to make it visible on the photo. Activator unknown.

CELESTITE, Toussit, Morocco UV longs / long-wave collection et photographie © Axel Emmermann Courtesy of the MKA (Mineralogische Kring Antwerpen)