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Muscovite

Posted by David Von Bargen  
avatar Muscovite
July 30, 2009 05:21PM
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



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
10 cm



Australia
Victoria, Lake Boga granite quarry


3 mm



Austria
Salzburg, Krautgarten Mt.


10 cm




Brazil
Espírito Santo, Mimoso do Sul Mine


12 cm



Brazil
Minas Gerais


5 cm
5 cm
5 cm
8 cm
3.5 cm
Fuchsite 6 cm



Brazil
Minas Gerais, Divino das Laranjeiras


10 cm



Brazil
Minas Gerais, Cigana claim


6 cm



Brazil
Minas Gerais, Zé Pinto prospect


9 cm



Brazil
Minas Gerais, Virgem da Lapa


4 cm




Canada
Ontario, Nipissing District


8 cm



Germany
Rhineland-Palatinate, Wannenköpfe


2 mm
3 mm



Germany
Saxony, Neumark, Diabase quarries


var Astrolite 2.5 cm



Italy
Aosta Valley, Prabornaz Mine


var Alurgite 4 cm




Madagascar
Fianarantsoa Province,Malakialina pegmatites


4 cm



Pakistan
Baltistan, Shengus


3 cm



Portugal
Viseu District, Real quarry


3 cm




USA
California, Pack Rat Mine


12 cm



USA
Maine, Mt. Apatite, Maine Feldspar Quarry


5 cm



USA
Maine, Lord Hill Quarry


5 cm



USA
New Hampshire, Palermo No. 1 Mine


8 cm



USA
New Mexico, Harding Mine


3 cm
9 cm



USA
North Carolina, Rist Mine


8 cm



USA
North Carolina, Lincoln Co.


Inclusions of garnet, rutile? 10 cm



USA
South Dakota, Diamond Mica Mine


8 cm





Pseudomorphs of Muscovite

Bolivia
Potosí Department, Llallagua


after orthoclase 10 cm



Japan
Kyoto Prefecture, Kameoka City


0.7 cm


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


USA
Arizona, Willow Spring Ranch


sericite after tourmaline 3 cm



USA
Maine, Noyes Mountain Quarry (Harvard Quarry)


sericite pseudomorph after tourmaline 2.5 cm



USA
New Hampshire, Atwood Mine


Pseudomorph after schorl 6 cm




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 11:46AM by Rock Currier.
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