The chemical-mineralogical characteristics of the main types of clays used in production of traditional Bohemian ceramics in small workshops of Keramo-Praha cooperative have been collected. For firing, a maximum temperature (1150–1160 °C) can be reached in current furnaces. It may be easy to deduce that for manufacture of vitrified "red" stoneware and ceramics are the most appropriate clays from locality Ledce-Zilov, Kacirov or Lhota u Dobran and for "white" stoneware those illite-kaolinite clays quarried from Kysice, Kopanina or Tvrsice. The most suitable clays for production of ceramics seem to be those from Tvrsice labeled as Stc.