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YUKONITE FROM THE GROTTA DELLA MONACA CAVE, SANT’AGATA DI ESARO, ITALY: CHARACTERIZATION AND COMPARISON WITH COTYPE MATERIAL FROM THE DAULTON MINE, YUKON, CANADA

Anna Garavelli¹, Daniela Pinto¹, Filippo Vurro^1,, Marcello Mellini², Cecilia Viti², Tonci Bali-uni³ and Giancarlo Della Ventura⁴

¹ Dipartimento Geomineralogico, Università di Bari, Via E. Orabona 4, I–70125 Bari, Italy
² Dipartimento di Scienze della Terra, Università di Siena, Via Laterina 8, I–53100 Siena, Italy
³ Department of Geography and Geology, University of Copenhagen, Øster Volgade 10, DK-1350 Copenhagen K, Denmark
⁴ Dipartimento di Scienze Geologiche, Università di Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Rome, Italy

View larger version (27K): [in this window] [in a new window]   FIG. 1. Location of the "Grotta della Monaca" cave, Sant’Agata di Esaro, Cosenza, Italy.

View larger version (108K): [in this window] [in a new window]   FIG. 2. (a) Back-scattered electron microphotograph of the Grotta della Monaca yukonite, showing dehydration-induced fractures, and (b) a granular texture, with close association of bright and dark grains.

View larger version (93K): [in this window] [in a new window]   FIG. 3. (a) TEM image of the Grotta della Monaca yukonite, showing grains finely intermixed with an amorphous matrix; (b) irregular, bent and polygonized lattice fringes.

View larger version (24K): [in this window] [in a new window]   FIG. 4a. Unpolarized single-crystal FTIR spectra of yukonite from the Daulton mine, Yukon, Canada, and from Grotta della Monaca cave, collected on randomly oriented ~30 mm thick fragments.

View larger version (39K): [in this window] [in a new window]   FIG. 4b. High-temperature FTIR spectra of yukonite from Grotta della Monaca. Temperature in °C. On the left side, the 2000–1000 cm–1 range is magnified for clarity.

View larger version (16K): [in this window] [in a new window]   FIG. 5. TG–DTA curves of the yukonite from Grotta della Monaca.

View larger version (21K): [in this window] [in a new window]   FIG. 6a. X-ray powder-diffraction patterns of yukonite from Grotta della Monaca (G) and Venus mine (V), Yukon Territory, Canada (ROM sample no. M37256, kindly placed at our disposal by the Royal Ontario Museum of Toronto). The sample from Grotta della Monaca contains some scorodite, whereas the one from the Venus mine has no additional phases.

View larger version (11K): [in this window] [in a new window]   FIG. 6b. X-ray powder-diffraction patterns of yukonite from the Daulton mine with quartz. CuK1 radiation, Guinier geometry. The background has been subtracted, and diagrams have been smoothed.

View larger version (13K): [in this window] [in a new window]   FIG. 7. XPS spectrum of yukonite from Grotta della Monaca.