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Valle del Cura, Iglesia Department, San Juan, Argentina

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Latitude & Longitude (WGS84): 29° 19' 36'' South , 69° 29' 45'' West
Latitude & Longitude (decimal): -29.32667,-69.49583
Köppen climate type:BWk : Cold desert climate

Valle del Cura (Priest´s Valley), Iglesia Department, Province of San Juan : High sulphidation epithermal deposits. Elevation: 2,834 m. asl.

Mineralization: Alunite, Boyleite, Kalinite, Jarlite, Wilcoxite, Mendozite, Potassium alum [Alum-(K)] and numerous secondary sulphates which are preserved due to the extreme aridity of the environment. The area is a high sulfidation system.

Kalinite: together with boyleite, both secondary sulfates, are preserved due to the extreme aridity of the environment.

Wilcoxite: In the zone of oxidation of deposits of high sulphidation. Associated with Jarlite and other sulfates.

Alunite-Natroalunite: granular masses of vitreous and Pearly surfaces of exfoliation, compact and earthy aspect have, as a result of the decomposition of rocks trachitic and their related by the reciprocal action of the dissolutions of ascending sulphides and oxidizing surface waters.

Mendozite, name given in 1828 by Mendoza, Argentina.
Chemical analysis (“San Juan”, Argentina. Anthony et al., 2003):
Al2O3 12,00 %
Na2O 7,96 %
SO3 37,70 %
H2O 41,96 %
Total 99,62 %

Jarlite: secondary product, in an area of intense hydrothermal alteration, as part of a system of high-sulphidation, and presence of alunite, gypsum, sericite, jarosite, goethite, fluorite, wilcoxite, boyleite, kalinite, pentahydrite and hexahydrite. Seen in tiny, tabular crystals or elongated, usually grouped in fans or spherical aggregates. It is closely associated with wilcoxite. It was identified by x-ray.

Mineral List

14 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Quaternary - Tertiary
0 - 66 Ma

ID: 3189371
Cenozoic volcanic rocks

Age: Cenozoic (0 - 66 Ma)

Lithology: Volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Thompson (1828). Annales of the Lyceum of Natural History. New York 3.19.
Angelelli, V., Brodtkorb, M.K. de, Gordillo, C.E. y Gay, H.D. (1983). Las Especies Minerales de la República Argentina. Subsecretaría de Minería. Publicación Especial. 528 pp.
Bengochea, L., Lara, R. y Mas, G. (1996), Kalinita y boyleita. Sulfatos secundarios del Área Valle del Cura; San Juan. 3ra Reunión de Mineralogía y Metalogenia. Instituto de Recursos Minerales, UNLP. Publicación 5: 63-66.
Bengochea, L. y Mas, G. (1998), Aparición de jarlita y sulfatos secundarios en el Valle del Cura, Argentina. Boletín de la Sociedad Española de Mineralogía, 21-A. Resúmenes de comunicaciones del Congreso de Mineralogía y Petrología, SEM 98 y 18° Reunión de la SEM, pág. 44-45.

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