Gold colored pyramid shaped nuggets in granite. Conducts electricity.?

Question

I've got this chunk of granite like rock that has a whole bunch of hard, heavy, nugget things embeded in the rock.
They are gold and silver colored double sided pyramid shaped things that conduct electricity and I have no idea what they are, or if they're valuable.

ANY ideas what they are?

Answer 1

Most likely they are iron pyrite or fool's gold. One of the crystal shapes they can take is an octahedron, which looks like a pyramid if you only see one side of it sticking out of the granite. If there are a lot of them in this peiec of granite and they are well shaped, some rock collectors might give you a nice sum of money for the rock.

Answer 2

Yay