Yeah, sorry for the confusion, not sure why I posted level thirty, must have been thinking about something else...
Didn't know about minerals being used in prestige, I don't play them that often, but I still feel mineral depositing was a more efficient way of gaining rewards for collecting minerals.
Also food doesn't sell for that much cr, and I've never personally felt the need to buy any as I have always had sufficient mats and minerals needed to craft sprite food, but others might so I suppose that is a fairly food use of minerals.
Thanks for the reply :)
You're wrong on the mineral section.
Blue and green - Used for prestige missions. It would be nice if more uses were added, though.
Minerals sprite doesn't use - Can be made into sprite food and traded to other players for crowns or the food they do need (or sold in the AH).
Mineral the sprite uses - If anything, it becomes more useful after level 30 (?).