Felspar. A fusible rock found almost pure or in combina- tion with potash and soda, the greater the percen- tage of alkalies the more fusible being the spar. It is used to replace more refractory materials in clay and to stiffen glazes.
Felspar. A fusible rock found almost pure or in combina- tion with potash and soda, the greater the percen- tage of alkalies the more fusible being the spar. It is used to replace more refractory materials in clay and to stiffen glazes.