Andesitic Lava (NaAlSi3O8 in game) solidifies into Andesite (Mg2SiO4 in game) which has a completely different formula. The material guide already has Basaltic Lava and Basalt as MG2SiO4, so I feel it would be more consistant to either replce the andesitic lava in the world with basaltic lava if you just want the lava to be a source of Mg2SiO4, or have the andesite formula changed to match its lava type