A few local stones I've found

Here's the full gallery.

I live in an area with a lot of volcanic activity, if that helps.

A. I'm 90% sure this is picrolite.

B. Sandstone?

C. I've seen very similar rocks that I think are picrolite, but they've always been green.

D. It looks similar to muscovite, and the colors change depending upon the angle of the Sun.

E. ?

F. ?