Fortune doesnt work on redstone and lapis

I used my fortune 3 pick on some lapis, because I need alot of it for my stained clay project. It gave me the same amount as usual (4-6) for all 6 ores, I thought I just got really unlucky, found some more lapis, still only 4-6 lapis from each ore. I then thought Is it the same with redstone? Tried mining redstone with it, still the normal amount of dust. 4-6.