Cone 9 Yellow (Mottled)

Dolomite 30
Whiting 8
Custer feldspar 25
EPK 16
Kaolin (Calc.) 13
Silica 8

Red iron oxide 3

Na2O 0.03 Al2O3 0.33 SiO2 1.43
K2O 0.06 P2O5 0.00
MgO 0.36 TiO2 0.00
CaO 0.55 Fe2O3 0.05

Alumina:Silica ratio is 1.00:4.29
Neutral:Acid ratio is 1.00:4.44
Alk:Neut:Acid ratio is 1.00:0.33:1.48

Expansion: 75.8 x 10e-7 per degree C