Lazurite is a MV-tier material, it has to be processed in MV-tierElectrolyzer in order for its chemical components to be obtained. It can also be used to craft Lapotron Crystal from IndustrialCraft2 mod.
Due to the excessive bulk of including all GregTech 5 blocks and items this navigation box only holds ~10% of all. The reader can view This and This navigation boxes to access the rest.