Mineralogical and colour changes of quartz sandstones by heat

By M. Hajpál, Á. Török. 2004

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Weathering and Deterioration (2011, background): “For example, the oxidation of iron minerals with the formation of hematite (Dionisio and Aires Barros 2004, Dionisio et al. 2005, Hajpál and Török 2004, Török and Hajpál 2005), the dehydration of clays, the decomposition of calcite or dolomite and the sudden contraction of quartz during…”
Experimental investigation of the thermal and mechanical stability of rocks for high-temperature thermal-energy storage (2017, background): “The change in color of the mafic and felsic rocks, calcareous sandstones, and quartz-rich conglomerates is attributed to the irreversible dehydration of Fe-rich minerals at temperatures of 250– 300 C, see Chakrabarti et al. [60], Hajpál and Török [58].”
Physical Properties of Sandstones After High Temperature Treatment (2012, background): “After high temperature treatment, changes in porosity are either related to thermal expansion and changes of the micro-crack network, or driven by the structural damage of rocks (Hajpál and Török 2004).”