Fine-grained fractions (0–2 mm), representing waste in the manufacture of crushed road aggregates of some granites, were tested as possible feldspar raw materials that could be utilized as a flux by the ceramics industry. Samples were collected in six quarries located within the Strzegom-Sobótka (Lower Silesia) granitoid massif. The industrial properties of the granite fines were established using the microscopic method and chemical analyses, while the tests of their suitability to produce ceramic tiles were carried out via hot stage microscopy and spectrophotometric color measurements of the tiles fired at 1200°C. The results indicate that it is the fine-grained waste of the Chwałków granite that maybe a valuable feldspar-bearing raw material to manufacture gres tiles. It is characterized by, among other indicators, the total alkali content exceeding 7.5% and the alkalinity modulus (K2O : Na2O) being below 1. These parameters significantly lower the melting temperature and even at such conditions result in the formation of sufficient volumes of a liquid phase, contrary to the mineral raw materials in which K-feldspars prevail over plagioclases. This waste material and other fine-grained fractions tested may, therefore, be a substitute for the traditional feldspar-bearing raw materials that are utilized in the manufacture of gres tiles with coloured bodies, among other usages.