Nice specimen! Very nice Muscovite crystals! I like how you can see the sides in photo #3. Looks like some nice crystals could form in that type of host. Look for Tourmaline and Beryl!
Prez, nice material. You should head over to Clear Creek. You're much closer than I otherwise I would live there on the weekends. West of Coalinga, those mountains are loaded with jaspers, jade, benitoite and more. Every time I have been up there I've come home a very happy man. You're in an excellent location, close to everything except our tourmalines down in San Diego. Keep diggin!