Fenacite e bertrandite della cava Laghetto, Colico (LC)

Phenakit e and bertrandit e of the Laghetto quarry, Colico (LC) The Laghetto pegmatite dike, belonging to the Piona pegmatite swarm, Colico municipality, Lecco province, is an Italian famous collecting locality because of the beautiful crystals of chrysoberyl found there. The vertical pegmatite dike had been mined for ceramic albite at the beginning of '900. During the winter 2002-2003 a field work allowed to find several beautiful chrysoberyl specimens associated to almandine garnet, zircon, uraninite and rare beryl. Closely associated to this primary paragenesis occur an interesting secondary hydrothermal association constituted by phenakite, bertrandite, secondary beryl, fluorapatite, and not determined secondary U-bearing minerals. The first two secondary Be-bearing species are new for this locality and for the whole Piona pegmatite swarm.