Akademik Veri Yönetim Sistemi
Symposium on Geomaterials in Cultural Heritage held at the 32nd International Geological Congress, Florence, İtalya, 20 - 28 Ağustos 2004, cilt.257, ss.141-142
Gokeyup cooking pottery is a particular type of pottery produced according to ancient craft tradition in western Turkey. It is made by mixing 75 wt% of local red and green smectitic clays with 25 wt% of local gneissic temper. Both temper and tempered objects are rich in MgO, as can be seen from XRF analyses. The vessels are coated with a sheet-silicate enriched layer, corresponding to the < 2 mm sieved fraction of the crushed gneissic temper. The pottery is fired for 45 min using the bonfire technique. Apart from the dehydroxylation of the smectites, no clear mineralogical difference can be observed between the unfired and fired products. The reduction factor FeO/FeOtot reveals no significant oxidizing or reducing firing conditions. As evidenced by SEM-EDS analyses, there is no chemical difference between the unfired and externally fired micas of the coating. The golden colouring is therefore due to the oxidation of the biotites during firing.