Encyclopedia > Muscovite

  Article Content

Muscovite

Muscovite, also known as potash mica, is an orthosilicate of aluminium and potassium. It has a highly perfect basal cleavage yielding remarkably thin laminae which are often highly elastic. Muscovite has a hardness of 2-2.25 and a specific gravity of 2.76-3. It can be colorless or tinted through grays, browns, greens, yellows, or rarely violet or red, and can be transparent or translucent.

Muscovite is the most common mica, found in granites, pegmatites, gneisses and schists, and as a contact metamorphic rock or as a secondary mineral resulting from the alteration of topaz, feldspar, kyanite, etc. In pegmatites it is often found in immense sheets which are commercially valuable. Muscovite is in demand for the manufacture of fireproofing and insulating materials and to some extent as a lubricant.

The name of muscovite comes from Muscovy-glass, a name formerly used for the mineral because of its use in Russia for windows.

See also: List of minerals



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
David McReynolds

... as a write-in SPA candidate and than in 1968 as a Peace And Freedom Party candidate for Congress. In 1980 he would run for President as the SPUSA candidate receiving over ...

 
 
 
This page was created in 36 ms