Is there silver mica?

[eureka77]

Found a huge rock of this in the creek. I a real newb to geology so sorry for the ignorance, but is there silver mica? Or is this just decomposing granite?

 

[eureka77]

Another

 

[3xflyfisher]

Eureka,

There is a silver colored mica and it is called muscovite. It does not have silver in it. And I think based on your pics, your guess of a decomposed granite is pretty close.

Regards,
3xflyfisher

 

[eureka77]

appreciate it.