What type of Sand is normally used for Sandboxes? I've heard some people love Masonry sand because it clean of small pebbles. Other like Concrete sand because it packs well.
Play sand or table sand are the only types you should use, for safety reasons. Other aggregates are not intended to be used by children who tend to eat the stuff, accidentally or intentionally. Though probably safe, aggregate sands are not produced or cleaned and tested with ingestion in mind. They don't just go the beach and get the sand and label it. It does go through some processing and can be contaminated by other products in the quarry or processing plant. It's best to err on the side of caution and just get the proper sand.