Investigation of some property changes of natural building stones exposed to fire and high heat

► The color of natural stones becomes lighter in appearance with increasing temperature. ► It is possible to polish all natural building stone samples up to 600 °C. ► While some samples can hold polish at 800 °C, all samples fall apart at 1000 °C. ► Depending on the composition and temperature exposure, color and lightness of samples change. ► Structure of natural building stone becomes damaged and/or changes when heated above 800 °C.