This is my homework last semester. I made a recipe for opaque glaze. I hope it helps you.

The formula is as follows:

Name of raw material w/%

9. 1 calcined talcum powder

Feldspar 42.6

Suzhou soil 5.8

Calcite 23

Zirconium silicate 15

Burning zinc oxide 2. 15

Timely 15.24