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Angel Mine, Sierra de Córdoba, Punilla Department, Córdoba, Argentina

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Latitude & Longitude (WGS84): 32° 27' 5'' South , 64° 51' 5'' West
Latitude & Longitude (decimal): -32.4513888889, -64.8513888889
Name(s) in local language(s):Mina Angel
Other regions containing this locality:South America

Pegmatites of this region are related to ancient Granites, hosted in crystalline schists belonging to the system of Sierras Pampeanas. Pegmatite mine "Angel" (province of Córdoba) is rich in Quartz, (Microcline) and pinched with poor plagioclase feldspar, and encloses Uraninite, Garnet, Triplite and rarely Gahnite and Zircon. The Uraninite occurs in cubic crystals isolated or associated in twinned, or girls bodies, within Muscovite or also in Garnet and up in Triplite. The oxidized components of uranium include: Gummite and Uranophane, Autunite and Renardite(Dewindtite), the latter impregnating masses of Mica, Feldspar and Quartz, up to 20 and more tons of volume, being also carrier as well as Columbite in pockets of some hundreds of kilograms.
The Boltwoodite appears in these pegmatites as a result of the weathering of Uraninite; in radial aggregates, and solid. Pale yellow; White streak; glassy shine to Pearl. Cleavage {010}, perfect; {001}, imperfect. D = 3, 5-4. PE = 3, 60. Presents weak fluorescent green under ultraviolet light. Radioactive.
Chemical Analysis:
SiO2: 14.00%.
UO3: 66,64%.
K2O: 10.97%.
H2O: 8.39%.

NOTE: See additional data under pages for the species "Gummite" and Vandendriesscheite.

Mineral List

25 valid minerals.

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Victorio Angelelli (1958). Los Minerales de Uranio, sus Yacimientos y Prospección. Departamento de Geología y Minería. Comisión Nacional de Energía Atómica.

E. Linares and R. O. Toubes (1960). Los minerales radiactivos de la República Argentina. 1ras Jornadas Geológicas Argentinas, 3: 191-205.

C. A. Rinaldi (1963). Estudio de las pegmatitas uraníferas de la Sierra de Comechingones. Tesis doctoral. Universidad Nacional de Buenos Aires.

R. O. Toubes, E. Chaar y J. P. Spikermann (1973). Minerales radiactivos de la República Argentina. 5 Congreso Geológico Argentino, 1, 249-260.

M. K. de Brodtkorb and H. D. Gay (1994). Las Especies Minerales de la República Argentina. Anexo 1981-1994. Instituto de Recursos Minerales.

Demartis, M., Melgarejo, J. C., Colombo, F., Alfonso, P., Coniglio, J. E., Pinotti, L. P., & D’Eramo, F. J. (2014). Extreme F activities in late pegmatitic events as a key factor for LILE and HFSE enrichment: The Ángel pegmatite, central Argentina. The Canadian Mineralogist, 52(2), 247-269.

C. T. Friz, F. Rodrigo and P.N. Stipanicic - Recursos y posibilidades Uraníferas en Argentina. Session 2.11 P/405. Comision Nacional de Energia Atomica.

Universidad Nacional de La Plata. Publicación N°4. 110 pp. La Plata.

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