The first issue is the price of spodumene. Maybe it will again become available in a ceramic grade. After all, spodumene-bearing rock is abundant, and battery technology is finding other solutions.
Second, in an LAS body the spodumene, kaolin and silica need to be in the proportions needed to form β-spodumene LiAlSi₂O₆ or β-eucryptite LiAlSiO₄ (along with residual quartz and glass phase). The testing program with meticulous records is needed. Repeat cycles of creating a body recipe, firing specimens at many temperatures below and above cone 6, and doing physical measurements on each.
Third, a dilatometer is needed to verify where on the firing curve the best low thermal expansion has been achieved. When that point is at cone 6 you have succeeded. As the cycling proceeds it will be evident if a more or less plastic kaolin is needed (or a bentonite addition).
Fourth, the super-low thermal expansion glaze (e.g. a high percentage of Frit 3249). Fortunately, it only needs to be slightly compressive. But ordinary glaze-fit tests are insufficient; this requires more thermal cycling with stovetop-like gradients.
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