Colemanite Glaze #14 Gloss/Clear

Volcanic ash 62
Colemanite 36
Magnesium carbonate 2
Total 100

Bentonite 1

Na2O 0.07 Al2O3 0.27 SiO2 2.81
K2O 0.19 B2O3 0.94 P2O5 0.00
MgO 0.08 TiO2 0.02
CaO 0.66 Fe2O3 0.02

Alumina:Silica ratio is 1.00:10.53
Neutral:Acid ratio is 1.00:2.36
Alk:Neut:Acid ratio is 1.00:1.20:2.85

Expansion: 71.2 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3