Explanation:

- Iron: Not referred to as 'buried sunshine'. It's a metal used mainly in construction and manufacturing.

- Bauxite: Not known as 'buried sunshine'. It's the primary source of aluminum.

- Mica: Not called 'buried sunshine'. It's a group of silicate minerals used in electronics and cosmetics.

- Coal: Popularly known as 'buried sunshine'. This is because it is formed from plant material that stored solar energy millions of years ago. When these plants died and were buried under sediment, they eventually transformed into coal.