What kind of sand would i need for laying slabs?

Sharp sand,put it down dry and then mix in cement,ratio 3 or 4:1,spread it in a five spot dice pattern then lower the slab,tap it down level and keep everybody off them for a week if possible.the moisture from the soil/air will activate the cement and harden it.Doing it this way means it's easier to level out slabs and they don't sink or tilt plus there's a measure of drainage under the slab in the voids.Provided nobody walks on them!I've used this method on 1' square up to 6'x4x6" flag stones,none of them sank.  more