Dims: 4.0" x 3.4" x 2.6" (10.2 x 8.6 x 6.6 cm)
Wt: 15.0 oz. (424 g)
Minas Gerais, Brazil
This hand specimen consists of dozens of hexagonal "books" of Muscovite that show moderate damage and generally good form. The largest of these books has dimensions of 1.8 x 1.5 x 0.1" (4.6 x 3.8 x 0.3 cm) and is incomplete due to heavy intergrowth. All have the standard pale brown coloration and pearly luster that are standard for this mineral, and though most books are essentially opaque, a few of the smaller, thinner books show definite translucence. There are patches of albite present on the specimen, and there is likely a "core" of this or another mineral at the center of the cluster, which would explain its heaviness.