If anyone has found and gathered sandstone, please can you post where because I have searched all over and can't find it. I'm thinking it's on the floating island but I'm not sure what to even look for. Please post the area they're in.
You cannot find sandstone at the present time. It is only found RARELY in wooden or silver chests in Celestia. You must buy the transmute recipes for sandstone and sunstone in order to complete the quest.