Katzensilber, ein gesteinsbildendes Mineral.
A colorless or pale brown mica with potassium.
White mica, KAl2Si3AlO10(OH,F)2, a common silicate mineral. It is colorless to silvery white with shiny surfaces, and like all micas it splits into thin flakes along its one perfect cleavage. Muscovite is a metamorphic mineral occurring mainly in schists; it is also found in some granites, and appears as shiny flakes on bedding planes of some sandstones.