Kamogawa Stone

Oxide	Analysis	Formula
CaO	5.98%	0.43
K2O	1.19%	0.05
MgO	3.01%	0.30
Na2O	3.41%	0.22
TiO2	2.24%	0.11
Al2O3	13.94%	0.55
SiO2	54.79%	3.66
Fe2O3	13.24%	0.33
LOI	2.19%	n/a
Oxide Weight		392.90
Formula Weight		401.70

Notes

We do not know much about this material, and have lost track of where this analysis is from. However, if this chemistry is correct, this is clearly a well fluxed material that would melt well. It also has an exceptionally high iron content not to mention alot of TiO2.

A potter from Japan told us that the glaze on black Raku tea bowls was made from Kamogawa stone and that they included lead.

By Tony Hansen
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