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Muscovite

Posted by David Von Bargen  
avatar Muscovite
July 30, 2009 04:21PM
    
Click here to view Best Minerals M and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.


Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities? After each set of pictures there should be some descriptive text. If none appears it means that we need someone to tell us about the specimens from that locality and something about the geology of the occurrence.


Muscovite

KAl2[(OH)2|AlSi3O10] Monoclinic

Minas Gerais, Brazil 6 cm© Rob Lavinsky


Thin sheets of muscovite (showing it's property of flexibility) are commonly available, but good examples of crystals are not particularly common. Almost all of the specimens are from pegmatites, with Brazil being the most prolific. Also sometimes sheets of muscovite with various inclusions are sold.

The earliest use of muscovite was for jewelry. The first major use of muscovite was as a window pane for wood and coal burning stoves. Currently sheet mica is used as an electrical insulator and in electronic capacitors. It is also used as a "glitter" component in cosmetics.

Muscovite is found in all types of rocks. It occurs as a detrital component in sandstones and arkoses, is a major component in metamorphic rocks (mica schists), as an accessory mineral in granites and pegmatites and the variety sericite is common in many hydrothermal deposits. Most commercial production is from large books in pegmatites.


The most common forms are hexagonal crystals, but you can also get star twins, and aggregates forming balls. The largest known crystal of muscovite came from the Purdy mica mine in Ontario Canada. It measured at least 2.4m long and 1.5m in diameter.


Argentina
Catamarca, Papachacra



10 cm© Rob Lavinsky
10 cm© 2008 Steve Hardinger


Australia
Victoria, Lake Boga granite quarry


3 mm© Judy Rowe


Austria
Salzburg, Krautgarten Mt.


10 cm© Gerd Stefanik



Brazil
Espírito Santo, Mimoso do Sul Mine


12 cm© Kuno Stoeckli


Brazil
Minas Gerais


5 cm© Rob Lavinsky
5 cm© Safaa Yu

5 cm© Rob Lavinsky
8 cm© Rob Lavinsky

3.5 cm© Martins da Pedra
Fuchsite 6 cm© JSS



Brazil
Minas Gerais, Divino das Laranjeiras


10 cm© Rob Lavinsky


Brazil
Minas Gerais, Cigana claim


6 cm© Martins da Pedra


Brazil
Minas Gerais, Zé Pinto prospect


9 cm© Weinrich Minerals, Inc.


Brazil
Minas Gerais, Virgem da Lapa


4 cm© CCURTO2009



Canada
Ontario, Nipissing District


8 cm© Russell G. Rizzo


Germany
Rhineland-Palatinate, Wannenköpfe


2 mm© frank de wit
3 mm© Fred Kruijen



Germany
Saxony, Neumark, Diabase quarries


var Astrolite 2.5 cm© M. Adelt


Italy
Aosta Valley, Prabornaz Mine


var Alurgite 4 cm© Paolo Grosso



Madagascar
Fianarantsoa Province,Malakialina pegmatites


4 cm© ARLIGUIE M


Pakistan
Baltistan, Shengus


3 cm© Christian Bracke


Portugal
Viseu District, Real quarry


3 cm© Rui Nunes 2008



USA
California, Pack Rat Mine


12 cm© Rob Lavinsky


USA
Maine, Mt. Apatite, Maine Feldspar Quarry


5 cm© 2007 D. Levesque


USA
Maine, Lord Hill Quarry


5 cm© 2007 Steve Bonney


USA
New Hampshire, Palermo No. 1 Mine


8 cm© 2006 Peter Cristofono


USA
New Mexico, Harding Mine


3 cm© 2010, JGW
9 cm© Rob Lavinsky



USA
North Carolina, Rist Mine


8 cm© Rob Lavinsky


USA
North Carolina, Lincoln Co.


Inclusions of garnet, rutile? 10 cm© 2003 John H. Betts


USA
South Dakota, Diamond Mica Mine


8 cm© Rob Lavinsky




Pseudomorphs of Muscovite

Bolivia
Potosí Department, Llallagua


after orthoclase 10 cm© Rob Lavinsky


Japan
Kyoto Prefecture, Kameoka City


0.7 cm© 2008, JGW

Variety sakura-ishi "cherry blossom stone" pseudomorphs after cordierite crystals.


USA
Arizona, Willow Spring Ranch


sericite after tourmaline 3 cm© 2001 John H. Betts


USA
Maine, Noyes Mountain Quarry (Harvard Quarry)


sericite pseudomorph after tourmaline 2.5 cm© 2001 John H. Betts


USA
New Hampshire, Atwood Mine


Pseudomorph after schorl 6 cm© 2007 Peter Cristofono



Click here to view Best Minerals M and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.



Edited 8 time(s). Last edit at 03/26/2012 10:46AM by Rock Currier.
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