Development of high temperature dense refractory bricks using clay minerals and grog has been carried out with a view to determining the consequence of variation in percentages of Al2O3.2SiO2.2H2O and grog on the properties of locally produced dense bricks. The raw materials were used to compose five batches (of five samples each) from all the clay minerals and their blends (ED1–EN5). The clay bodies were hydraulically shaped and oven dried at 1100C. The properties of the produced bricks investigated after sintering at 13500C indicated that samples ED1–EN5 had shrinkage ranging from 8.4%-11.5% with corresponding bulk density of 1.57g/cm3–2.26g/cm3 respectively. The investigation revealed that samples ED1–EN5 of the bricks as stated above had compressive strength ranging from 13.5MPa–23.1MPa with corresponding porosity ranging from 12.84% -23.39% respectively. The estimated refractoriness using shuen’s formula shows that samples ED–EN5 had 16660c-17680c, while the result of the refractoriness using pyrometric cone equivalent indicated that samples ED1–EN5 had cone 30(16600C)– <34(<17500C) respectively. The spalling-count test result revealed that samples as stated above had number of cycles ranging from 19-35 respectively. It was discovered that the higher the grog content, the lower the shrinkage, bulk density and compressive strength while the higher the porosity, spalling-count-cycle with refractoriness, and vice versa when considering blended samples with increase in Al2O3.2SiO2.2H2O content. However, sample EN4 gave the most apposite result when considering the properties stated above. Therefore sample EN4 is recommended for mass production of dense refractory bricks for high temperature applications.