Dims: 3.7 x 1.9 x 0.9" (9.5 x 4.8 x 2.3 cm)
Wt: 5.7 oz. (163 g)
Sentinel Rock, El Paso County, Colorado, U.S.A.
This large hand specimen consists of a "book" of Zinnwaldite mica that is in excellent condition. Its pseudohexagonal form is likewise excellent, and though its form is not complete, it is not caused by any form of damage. The book has a rather dark brown color and the standard pearly, micaceous luster, and is opaque, though individual sheets would likely be transparent. There is almost no host rock present.