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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.


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.

Catamarca, Papachacra

10 cm© Rob Lavinsky
10 cm© 2008 Steve Hardinger

Victoria, Lake Boga granite quarry

3 mm© Judy Rowe

Salzburg, Krautgarten Mt.

10 cm© Gerd Stefanik

Espírito Santo, Mimoso do Sul Mine

12 cm© Kuno Stoeckli

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

Minas Gerais, Divino das Laranjeiras

10 cm© Rob Lavinsky

Minas Gerais, Cigana claim

6 cm© Martins da Pedra

Minas Gerais, Zé Pinto prospect

9 cm© Weinrich Minerals, Inc.

Minas Gerais, Virgem da Lapa

4 cm© CCURTO2009

Ontario, Nipissing District

8 cm© Russell G. Rizzo

Rhineland-Palatinate, Wannenköpfe

2 mm© frank de wit
3 mm© Fred Kruijen

Saxony, Neumark, Diabase quarries

var Astrolite 2.5 cm© M. Adelt

Aosta Valley, Prabornaz Mine

var Alurgite 4 cm© Paolo Grosso

Fianarantsoa Province,Malakialina pegmatites


Baltistan, Shengus

3 cm© Christian Bracke

Viseu District, Real quarry

3 cm© Rui Nunes 2008

California, Pack Rat Mine

12 cm© Rob Lavinsky

Maine, Mt. Apatite, Maine Feldspar Quarry

5 cm© 2007 D. Levesque

Maine, Lord Hill Quarry

5 cm© 2007 Steve Bonney

New Hampshire, Palermo No. 1 Mine

8 cm© 2006 Peter Cristofono

New Mexico, Harding Mine

3 cm© 2010, JGW
9 cm© Rob Lavinsky

North Carolina, Rist Mine

8 cm© Rob Lavinsky

North Carolina, Lincoln Co.

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

South Dakota, Diamond Mica Mine

8 cm© Rob Lavinsky

Pseudomorphs of Muscovite

Potosí Department, Llallagua

after orthoclase 10 cm© Rob Lavinsky

Kyoto Prefecture, Kameoka City

0.7 cm© 2008, JGW

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

Arizona, Willow Spring Ranch

sericite after tourmaline 3 cm© 2001 John H. Betts

Maine, Noyes Mountain Quarry (Harvard Quarry)

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

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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