Abstract
The pyrite of Almadén provides an excellent record of the early history of the sediments. It is especially important as it appears on a regional scale as a constituent feature of the “Criadero Quartzite”. The pyrite crystals are built up of a macromosaic nucleus surrounded by a diagenetic cortex. Framboids of the nucleus display frequently a mutual orientation, a structure which is unusual in “Rogenpyrit”. The cortices display different growth types (zonal, fibrous and sectorial).
Cinnabar and pyrrhotite appear only within the nucleus and never in the cortex. Cinnabar thus precipitated under equilibrium conditions between pyrite and pyrrhotite. Mercury was present before the addition of the diagenetic pyrite cortices, since it is trapped in the nucleus.
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Arnold, M., Maucher, A., Saupe, F. (1973). Diagenetic Pyrite and Associated Sulphides at the Almadén Mercury Mine, Spain. In: Amstutz, G.C., Bernard, A.J. (eds) Ores in Sediments. International Union of Geological Sciences, vol 3. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-65329-2_2
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DOI: https://doi.org/10.1007/978-3-642-65329-2_2
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