Manuel-Mercedes open pit, Cala Mines, Cala, Huelva, Andalusia, Spain

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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.

References