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Lithium Carbonate is the best source of lithium oxide for glazes. It is slightly soluble. It is unusual to see more than 5% lithium carbonate in glaze. Because of the low expansion of Li2O, high lithium glazes tend to shiver.
Lithium carbonate is a very strong flux. In contrast, other lithium compounds may be quite refractory: lithium zirconate and lithium aluminum spinel are examples.
In addition to being soluble, lithium carbonate produces gases as it decomposes and these can cause pinholes or blisters in glazes.