Uranopolycrase, Quartz
Fonte del Prete, San Piero in Campo, Campo nell'Elba, Livorno Province, Tuscany, Italy
Tabular crystals, in parallel association, brown in the lower part to become pitch black in the upper part, partially covered by white lumps of 'apatite', on smoky quartz crystal. See: "Giannettoni, L., Gini, C., Guelfi, F., Orlandi, P., and Sovilla, S . (1993) Uranopolicrasio, una nuova specie dell'Isola Elba. Rivista Mineralogica Italiana, 17, 4 ...