Cornish stone

I have a Data Sheet from Cookson Ceramics Ltd., Stoke-on-Trent which gives the following analysis for Cornish Stone: ^[1]

SiO2 73.2%

Al2O3 15.3%

Fe2O3 0.13%

TiO2 0.06%

CaO 1.47%

MgO 0.13%

Na2O 3.44%

K2O 4.45%

P2O5 0.47%

Loss @ 1025% 1.53%

This gives a Unity Formula of K2O .358 Al2O3 1.134 SiO2 9.220 Na2O .419 Fe2O3 0.006 P2O5 0.025 CaO .198 MgO .025

La Cornish stone se puede reemplazar así ^[2]: 100 partes Cornish stone=