Small crystals of uraninite included within the fluorite crystals.
Reference:
[Tritlla, J. and Levresse, G. (2006).- Comments on “(U–Th)/He dating of fluorite: application to the La Azul fluorspar deposit in the Taxco mining district, Mexico” by Pi et al. (Mineralium Deposita 39: 976–982). Mineralium Deposita. 41, 296-299]
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