Various rocks to identify

[Onyxx]

Hello, I am looking for some people with good knowledge to identify some rocks from my childhood collection, for instance these 2:

A wild guess, would be Quartz for both. Any ideas of the type?

The second one, it looks like it's covered with iron Pyrite, not sure if it's man made or natural.

Thanks

 

[Onyxx]

On my question was published! Nice I hope somebody will have the knowledge to help me here.

I think the second crystal, the point, must be some kind of Milky Quartz.