March 2026: We are doing major upgrades to code here, please be patient regarding any issues. If any page is not working for a period of hours, please contact us. Thank you.
| Monthly Tech-Tip | Feb 14-15, 2026 - Major Server Upgrade Done | No tracking! No ads! |
Description: Soda feldspar
| Oxide | Analysis | Formula | Tolerance |
|---|---|---|---|
| CaO | 2.86% | 0.36 | |
| Na2O | 5.54% | 0.64 | |
| Al2O3 | 17.07% | 1.19 | |
| SiO2 | 74.31% | 8.81 | |
| LOI | 1.50% | n/a | |
| Oxide Weight | 711.01 | ||
| Formula Weight | 721.84 | ||
Another formula that we have is quite different from the one shown here. There is no way to verify where either one came from, however this one may be more correct since it has K2O, which it is difficult to imagine any feldspar lacking completely.
K2O 0.5
Na2O 0.4
CaO 0.1
Al2O3 1.45
SiO2 6.45
| Typecodes |
Feldspar
The most common source of fluxes for high and medium temperature glazes and bodies. |
| By Tony Hansen Follow me on ![]() | ![]() |
Buy me a coffee and we can talk