Cone 4 #30 Quintessence

Custer feldspar 31
Dolomite 10
Barium carbonate 9
Whiting 11
EPK 10
Silica 19
Zinc oxide (Calc.) 10
Total 100

Na2O 0.03 Al2O3 0.20 SiO2 1.71
K2O 0.08 P2O5 0.00
MgO 0.12 TiO2 0.00
CaO 0.38 Fe2O3 0.00
ZnO 0.28
BaO 0.10

Alumina:Silica ratio is 1.00:8.35
Neutral:Acid ratio is 1.00:8.36
Alk:Neut:Acid ratio is 1.00:0.20:1.71

Expansion: 79.0 x 10e-7 per degree C