The recipe for a Lapotron Crystal doesn't specifically use lapis lazuly. Rather, any blue dye will do.

In main/java/techreborn/init/recipes/CraftingTableRecipes.java, line 125:

registerShaped(getStack(ModItems.LAPOTRONIC_CRYSTAL), "LCL", "LEL", "LCL", 'L', "dyeBlue", 'E', "energyCrystal", 'C', "circuitBasic");