It can be observed from Fig. 6 and Fig. 7 that there is a decrease in water absorption and porosity for all samples with increasing temperature. It is a natural behavior of a ceramic body. With increase in firing temperature, values for water absorption tend to decrease since a greater densification of the sample occurred. The water absorption of the samples ranged from 2% to 8%. The water absorption of all samples is below 10%, which is compatible with the range specified for ceramic tiles. We found about 6% water absorption for 20%, 30% and 40% mixture of rock dust at 900 °C temperature. The behavior of water absorption as firing temperature was better for 20% and 30% rock dust than other samples.