Cone 4 #23 Transparent

Lithium carbonate 3
Custer feldspar 48
Wollastonite 21
Barium carbonate 4
Zinc oxide (Calc.) 2
Magnesium carbonate 4S
Silica 16
Total 100

Na2O 0.06 Al2O3 0.21 SiO2 2.52
K2O 0.13 Fe2O3 0.00
MgO 0.14
CaO 0.46
Li2O 0.10
ZnO 0.06
BaO 0.05
Total 100

Alumina:Silica ratio is 1.00:12.11
Neutral:Acid ratio is 1.00:12.12
Alk:Neut:Acid ratio is 1.00:0.21:2.52

Expansion: 75.6 x 10e-7 per degree C
Oxides causing abnormal expansion: Li2O