Muscovite

Muscovite forms thin, flat crystals that grow to enormous sizes. Pegmatites are the major source of muscovite and other mica species, which are often used for electrical insulation and shingles. The chemical composition of muscovite is KAl2(Si3Al)O10(OH,F)2.

Group: Silicates
Image Number: 95-40138
Catalog Number: R1534600
W. A. Roebling