Ceramic applicability of quartzfeldspatic materials formed by weathering of plutonic bodies: a case of study (Northern Jaén, Spain)

ISSN 1121-7588
M. Vázquez, J. Jiménez-Millán
Departamento di Geología, Facultad de Ciencias Experimentales, Universidad de Jaén, Campus Universitario, Jaén, Spain.


The suitability of materials formed by weathering of the granodioritic stocks from Linares and Santa Elena in the Central Iberian Zone of the Southern Iberian Massif has been evaluated to make stoneware bodies. Samples from Linares have lower phyllosilicate content and higher feldspar and quartz contents than those from Santa Elena. The highest kaolinite contents are found in the Santa Elena samples. Illite/smectite mixed layer is only present in the weathered materials from Linares. The studied samples have high silica (58-71%) and alumina (14-21%) contents. Fe2O3 contents (6.50-4.55%) from Santa Elena are remarkably higher than those of Linares samples (3.67-2.75%). Clay fraction is the grain size dominant in milled materials, followed by the 2-20 μm fraction. Most of the Santa Elena materials are potentially suitable for shaping by extrusion, while the samples from Linares are only appropriated for shaping by pressing. Low water absorption (<4%) and linear shrinkage values (<13%) at the firing temperature range between 1000 ºC and 1200 ºC are related to the extent of the vitrification process. Mineralogical and chemical composition as well as firing properties of the quartz-feldspathic materials studied suggest that they could be used to make red stoneware.
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