lapis spawns

Does coal or lapis or cobblestone gives xp if yes than how much? And how to see how much they are giving for one block.

Ok, this idea may sound stupid, but add Lapis to the game. My idea would for Lapis to be able to be used for enchantments, from a NPC, called Harry, who you can buy for 5 lapis in the shop. There would be no home base upgrade for lapis, and there is only one generator at middle. This generator...