Mineralogical and Technological Characteristics of Volcanic Rocks around Nevşehir Province of Türkiye

Abstract

In this study, rock samples were taken from study area, Tuzköy, Gülşehir, Avanos and Ürgüp Units, Nevşehir Province (Türkiye) and their mineralogical and petrographical properties were investigated. In addition, preliminary technological tests of some samples have been made. Physical and chemical analysis, thin section, XRD, SEM-EDX and firing tests were performed on the test samples. Original color and condition of these samples and their water dispersion, plasticity, reaction with dilute acid, firing color and condition were investigated to determine their potential to use as ceramic raw material. The rocks were found to be calc-alkaline, rich in silica and high potassium peralumina, with rhyolitic and dacitic character. Zeolite minerals were identified, including erionite, which poses a health risk. While erionite-free samples exhibited colors and properties suitable for the ceramic industry, their presence necessitates caution in industrial use due to health concerns. As a result, some samples (Nev 25, Nev 31, Nev 43, Nev 47, and Nev 48) are suitable for use at temperatures below 1150 °C while some others (Nev 44, Nev 54, and Nev 61) at temperatures below 1300 °C. In the investigated areas, the distribution of erionite minerals should be identified and mapped, and further detailed investigation of non-erionite-bearing areas in line with the study’s objectives is considered important from an economic geology perspective.