Synthetic Cornwall Stone Recipes
From Clara Giorello:
100 gr Cornwall Stone = 41 gr Potash Feldspar + 28 gr sodium Feldspar + 8 gr APM112 Clay + 2 gr whiting + 21 silica
Cornwall Stone (volume) = potash feldspar 8 + Silica 2 + Kaolin 1
From Mike Mangion:
Cornwall Stone #1
Original Material, FORMULA & ANALYSIS
*CaO… .26 2.02%
*MgO…
*K2O… .29 3.74%
*Na2O… .44 3.74%
Fe2O3… .01 .14%
TIO2… .01 .07%
AL2O3… 1.16 16.14%
SiO2… 9.03 73.65%
P2O5… .03 .51%
RATIO 7.76
EXPAN 399.42
WEIGHT 735.81
Substitution Recipe, FORMULA & ANALYSIS
G 200 SPAR… 53.00%
EPK… 15.50%
SILICA… 28.50%
WHITING… 3.00%
Total……………100.00%
*CaO…30 2.18%
*MgO…01 .03%
*K2O… .49 5.94%
*Na2O…21 1.66%
Fe2O3…01 .18%
TIO2…00 .05%
AL2O3… 1.23 16.20%
SiO2… 9.50 73.74%
P2O5…00 .02%
RATIO 7.74
EXPAN 398.48
WEIGHT 772.69
Cornwall Stone #2
Original Material, FORMULA & ANALYSIS
Oxide Analysis Formula
CaO 1.81% 0.240
MgO 0.14% 0.026
K2O 4.30% 0.339
Na2O 3.30% 0.395
TiO2 0.15% 0.014
Al2O3 16.33% 1.189
SiO2 73.76% 9.117
Fe2O3 0.20% 0.009
Oxide Weight 742.81
Formula Weight 742.81
Substitution Recipe, FORMULA & ANALYSIS
Dolomite… 0.37
Custer Feldspar… 30.43
Wollastonite… 3.30
Kaolin… 12.85
Silica… 29.29
Nepheline Syenite… 23.75
100.00%
