Gem, Rock, and Mineral Postage Stamps Featuring

Mineral Name: Muscovite
Composition: Potassium aluminum silicate hydroxide fluoride
Nomenclature: Named after the Russian province of Muscovy.
Industrial Uses: Electrical insulators; heat insulators.
Additional Notes: A member of the Mica group of minerals. Muscovite has a layered structure that allows it to be cleanly and evenly split into flat sheets with ease. Thin sheets of muscovite are very flexible, but possess high tensile strength. Isinglass refers to large sheets of muscovite that were used as window panes.

Angola Scott 559
Muscovite (Mica)
Scott 559
4.5 escudo
31 Oct 1970

The stamp shows a natural, unpolished mineral specimen. Philatelic Mineralogy Copyright © 1997-2010 by Richard Busch