We need any usefulness for the gravel and for the lapislazuli.The lapislazuli only to dye and this is a bit useless and the gravel only give a flint, we need usefulness for the gravel and the lapislazuli. An idea for the gravel is that with water it forms clay and for the lapislazuli is that we can make tools of lapis lazuli,armors of lapislazuli,swords of lapis lazuli... .Thanks.