Photos are not clear enough to see -- and the lighting is all wrong to tell the color or shape of what could be (or not be) the pyrite crystals. I'm thinking there's a good chance that it is a mica, but I really can't see well enough. If there is a gem and mineral club in your area (or a rockhound, if you can find one), you might try stopping by to ask one of the members to help you out. They can run some very simple tests to tell hardness and streak color to help determine what that is on the host rock.
Good luck and come back to report what you found out!
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“Let’s work the problem, people. Let's not make things worse by guessing.” -Gene Kranz, Mission Control Director (played by Ed Harris), Apollo 13
