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Manuel-Mercedes open pit, Cala Mines, Cala, Huelva, Andalusia, Spain
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Name(s) in local language(s): Corta Manuel-Mercedes, Minas de Cala, Cala, Huelva, Andalucia, España
 
From a geological point of view, the deposit of the Cala Mine is located in the south flank of the (antiform) Olivenza-Monesterio, inside of the zone Ossa-Morena. In this area, Palaeozoic rocks were affected by Hercynian tectonics. The granitic intrusions were accompanied by contact metamorphism (skarn formation) with important deposits of magnetite.

Cala is included in Sierra de Aracena range, a part of Sierra Morena range.

Recent analysis (XRD) have confirmed again the presence of ferropargasite in this locality (green sprays as seen in the pictures). It must be said that there is no a complete certainty because with complex amphiboles like these further analysis would be neccessary (Polarised-light microscopy and EPMA).

Mineral List

Amphibole Supergroup
var: Uralite

Andradite
Azurite
Calcite
Chalcopyrite
'Chlorite Group'
Chrysocolla
Diopside
Dolomite
Epidote
Ferro-pargasite
'Garnet'
Gersdorffite
Glaucodot
Goethite
Hematite
Magnetite
Malachite
Marcasite
Millerite
Nickeline
Nickelskutterudite
Pyrite
Pyrrhotite
Quartz
Skutterudite
Titanite


27 entries listed. 24 valid minerals.

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References

- Econ Geol (1981) 76:719-727

- García, M., García, G. and Calvo, M. (2003) Minas de Cala. El hierro con cobre. Bocamina (12), 48-81

- Calvo, M. (2003) Minerales y Minas de España, Vol 2. Diputación Foral de Alava. 705 pages.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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