Spodumene Substitute Analysis
Laguna's Spodumene Substitute Analysis below. Compared to Insight Glaze Calc Materials Data the Li2O is down nearly a full percent. (Slight decrease in Al2O3 and SiO2 although those are probably not significant in most glaze recipes)
I asked Pottery Supply House in Ontario if their Spodumene Blend is the same product and they confirmed it is.
I would suggest the Li2O difference could very well make a difference to glaze fit and/or colour response in some glazes. So not only is the pric
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This discussion of a spod substitute blend is interesting in another way. I personally and the studios I work with have enough spod on hand to meet our needs for quite awhile, if only because we don't use much of it. I even have some of the old Foote, as well as the newer Gwalia. What strikes me now is how reminiscent this is of the time the Gerstley Borate mine closed. It didn't take long for a number of substitute blends to move into that vacant space - Laguna Borate, Gillespie Borate, CadyCal