Answer:
rub me and a genie might appear
I am the minerals vital for your good health.
I am a key that is playful. What am I?
I can speak with my hard metal tongue. But I cannot breathe, for I have no lung. What am I?
I am milky white and scares people.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.