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Mineralpedia Details for Muscovite

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Muscovite

Muscovite

Formula
KAl2(Si3Al)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Massive - Lamellar, Foliated, Micaceous 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
white, gray, silver white, brownish white, greenish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Sectile 
Hardness
2-2.5 
WebMineral
View Muscovite 
Mindat
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Muscovite from Binntal, Wallis, Switzerland

Muscovite
            from Binntal, Wallis, Switzerland

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal.

Rich chromium Muscovite.

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Muscovite from Walden Gem quarry, Portland, Middlesex Co., Connecticut, United States

Muscovite
            from Walden Gem quarry, Portland, Middlesex Co., Connecticut, United States

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal. You might call Muscovite the generic mica or the original mica to which all subsequent micas were modelled after.

This specimen may contain Rb, which causes the "ruby" color.

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Muscovite from Rutherford Co., North Carolina, United States

Muscovite
            from Rutherford Co., North Carolina, United States

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal.

Green flakes of chromium rich Muscovite with red corundum.

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Muscovite from Lengenbach quarry, Binn Valley, Wallis, Switzerland

Muscovite
            from Lengenbach quarry, Binn Valley, Wallis, Switzerland

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal.

This locality demonstrates the diversity in which Muscovite occurs. At Lengenbach, hydrothermal mineralization of base metals occured in Triassic dolostones in which at least 130 minerals (Mindat) have been identified. Muscovite being just incidental to tht overall selection of rare sulfides and sulfosalts.

On this piece, Muscovite crystals occur as slightly pale green platy crystals.

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Muscovite from Franklin, Sussex Co., New Jersey, United States

Muscovite
            from Franklin, Sussex Co., New Jersey, United States

Large dep brown foliated plate of Muscovite, although this one could easily be Hendricksite of a Biotite.

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Muscovite from Warren Brothers quarry, Bristol Co., Massachusetts, United States

Muscovite
            from Warren Brothers quarry, Bristol Co., Massachusetts, United States

This specimen contains hundreds of pseudohexagonal platy crystals to 7-10mm.

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Muscovite from Branchville, Fairfield Co., Connecticut, United States

Muscovite
            from Branchville, Fairfield Co., Connecticut, United States

An excellent example of "ball-peen" muscovite.

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Muscovite from Aldeia do Eme mine, Conselheiro Pena, Minas Gerais, Brazil

Muscovite
            from Aldeia do Eme mine, Conselheiro Pena, Minas Gerais, Brazil

A little worn but an outstanding example of a complete Muscovite crystal showing rosette-like growth. Good looking on front and back. Ruby red internal reflections. Ex. Art Smith

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Muscovite from Barra do Salinas, Coronel Murta, Minas Gerais, Brazil

Muscovite
            from Barra do Salinas, Coronel Murta, Minas Gerais, Brazil

A cleavage slice of interesting Muscovite rimmed by perhaps Lepidolite.

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Muscovite from Conselheiro Pena, Minas Gerais, Brazil

Muscovite
            from Conselheiro Pena, Minas Gerais, Brazil

A very nice plate of ruby colored Muscovite with crystals to 4.5cm across. With the Muscovite are dark green prismatic Fluorapatite to 1.4cm.

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