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Muscovite

This page kindly sponsored by Mike Richardson
Formula:
KAl2(AlSi3O10)(OH)2
System:
Monoclinic
Colour:
White to colorless, ...
Lustre:
Vitreous, Silky, Pearly
Hardness:
Member of:
Name:
The earliest names attributable to muscovite include Muscovy Glass, Cat Silver, and Lapis Specularis (stone mirror); these names appearing in texts in the seventeenth century and before. The stand-alone name 'Muscovite' was used as early as 1794 by Johann Gottfried Schmeisser in his System of Mineralogy and is derived from the term "Muscovy glass," which was in common use by that time. Muscovy Province in Russia yielded sheet mica for a variety of uses. Muscovite and sometimes similar species were earlier called mica (Phillips and Kersey, 1706), glimmer (Phillips and Kersey, 1706), and isinglass (1747 according to OED) but all of these terms are still in use to some degree. It should be noted that mica, glimmer, and isinglass were also used for a variety of materials before these given dates and in those earlier times did not always indicate what would be a mineral, much less muscovite proper. Isinglass, for example, was originally used for a gelatinous bladder found in sturgeon.
Mica Group.

The most common of the Mica Group minerals, it is typically found as massively crystalline material in "books" or in flaky grains as a constituent of many rock types. It is clear with a pearly luster on cleavage faces, often having a sparkly look in rocks.
Several polytypes are known (see below); the most common one is the 2M1 polytype.

It can form a continuous series with celadonite and aluminoceladonite; intermediates are known as the variety phengite and K-deficient variants as illite.

Visit gemdat.org for gemological information about Muscovite.


Classification of Muscovite

Approved, 'Grandfathered' (first described prior to 1959)
9.EC.15

9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
Dana 7th ed.:
71.2.2.1
71.2.2a.1

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
16.3.8

16 : Silicates Containing Aluminum and other Metals
3 : Aluminosilicates of K

Physical Properties of Muscovite

Vitreous, Silky, Pearly
Transparency:
Transparent, Translucent
Colour:
White to colorless, silvery-white, and tinged various colors by impurities.
Streak:
White
Hardness:
2½ on Mohs scale
Hardness Data:
Measured
Comment:
2.5 parallel to [001], 4 perpendicular to [001]
Tenacity:
Elastic
Cleavage:
Perfect
Perfect on {001}.
Parting:
On {110} and {010}.
Fracture:
Micaceous
Density:
2.77 - 2.88 g/cm3 (Measured)    2.83 g/cm3 (Calculated)

Optical Data of Muscovite

Type:
Biaxial
RI values:
nα = 1.552 - 1.576 nβ = 1.582 - 1.615 nγ = 1.587 - 1.618
2V:
Measured: 30° to 47°, Calculated: 38° to 42°
Max Birefringence:
δ = 0.035 - 0.042
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v weak
Pleochroism:
Weak
Comments:
Weak when colored

Chemical Properties of Muscovite

Formula:
KAl2(AlSi3O10)(OH)2
IMA Formula:
KAl2(Si3Al)O10(OH)2
Common Impurities:
Cr,Li,Fe,V,Mn,Na,Cs,Rb,Ca,Mg,H2O

Crystallography of Muscovite

Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Muscovite-1MMuscovite-1MdMuscovite-2M1Muscovite-2M2Muscovite-3T
     
Monoclinic  Monoclinic  Trigonal 
2 - Sphenoidal 2/m - Prismatic 3 2 - Trapezohedral
B2  B2/b  P31 1 2
C2  C2/c   
a = 5.186 Å, b = 8.952 Å, c = 10.12 Å
β = 101.8°

a = 5.19 Å, b = 9.04 Å, c = 20.08 Å
β = 95.5°

a = 5.1963(4) Å, c = 16 Å
a:b:c = 0.579 : 1 : 1.13 a:b:c = 0.574 : 1 : 2.221 a:c = 1 : 3.079
V 459.89 ų
(Calculated from Unit Cell)
 V 937.77 ų
(Calculated from Unit Cell)
 V 374.14 ų
(Calculated from Unit Cell)
     

Crystallographic forms of Muscovite

Crystal Atlas:
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Muscovite no.7 - Goldschmidt (1913-1926)
Muscovite no.12 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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X-Ray Powder Diffraction

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
10.01 (100)
5.02 (60)
4.48 (60)
4.46 (70)
3.35 (100)
3.21 (50)
2.59 (50)
2.56 (90)
Comments:
Data given are for the -2M^1 polytype.

Type Occurrence of Muscovite

Relationship of Muscovite to other Species

Series:
Forms a series with Paragonite (see here)
Forms a series with Celadonite (see here)
Member of:
Other Members of this group:
AluminoceladoniteK(Mg,Fe2+)Al(Si4O10)(OH)2
Anandite(Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2
AnniteKFe2+3(AlSi3O10)(OH)2
AspidoliteNaMg3(AlSi3O10)(OH)2
BalestraiteKLi2V5+Si4O12
BiotiteA series or subgroup of the Mica Group.
BityiteLiCaAl2(AlBeSi2O10)(OH)2
BoromuscoviteKAl2(BSi3O10)(OH)2
Brammallite(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Chernykhite(Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2
ChromceladoniteK(Mg,Fe2+)(Cr,Al)(Si4O10)(OH)2
ChromphylliteK(Cr,Al)2(AlSi3O10)(OH,F)2
ClintoniteCa(Mg,Al)3(Al3SiO10)(OH)2
EastoniteKMg2Al(Al2Si2O10)(OH)2
EphesiteLiNaAl2(Al2Si2O10)(OH)2
FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
Ferrokinoshitalite(Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2
FluoranniteKFe2+3(AlSi3O10)(F,OH)2
FluorophlogopiteKMg3(AlSi3O10)(F,OH)2
Ganterite(Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2
GarmiteCsLiMg2(Si4O10)F2
Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
HendricksiteK(Zn,Mg,Mn2+)3(AlSi3O10)(OH)2
IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Kinoshitalite(Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2
LepidoliteA Li-rich mica in, or close to, the so-called Polylithionite-Trilithionite series.
LuanshiweiiteKLiAl1.50.5(Si3.5Al0.5)O10(OH,F)2
ManganiceladoniteKMgMn3+Si4O10(OH)2
MargariteCaAl2(Al2Si2O10)(OH)2
Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2
Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4
NanpingiteCsAl2(AlSi3O10)(OH,F)2
Natro-glauconite(Na,K)(Fe3+,Al,Mg)2((Si,Al)4O10)(OH)2
NorrishiteKLiMn3+2(Si4O10)O2
Oxykinoshitalite(Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2
OxyphlogopiteK(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2
ParagoniteNaAl2(AlSi3O10)(OH)2
PhengiteKAl2(AlSi3O10)(OH)2
PhlogopiteKMg3(AlSi3O10)(OH)2
PolylithioniteKLi2Al(Si4O10)(F,OH)2
PreiswerkiteNaMg2Al(Al2Si2O10)(OH)2
RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
ShirokshiniteKNaMg2(Si4O10)F2
ShirozuliteK(Mn2+,Mg)3(AlSi3O10)(OH)2
SiderophylliteKFe2+2Al(Al2Si2O10)(OH)2
SokolovaiteCsLi2Al(Si4O10)F2
Suhailite(NH4)Fe2+3(AlSi3O10)(OH)2
TainioliteKLiMg2(Si4O10)F2
TetraferrianniteKFe2+3((Fe3+,Al)Si3O10)(OH)2
TetraferriphlogopiteKMg3(Fe3+Si3O10)(OH,F)2
Tobelite(NH4,K)Al2(AlSi3O10)(OH)2
TrilithioniteK(Li1.5Al1.5)(AlSi3O10)(F,OH)2
UM1988-22-SiO:AlCaFFeHKLiMgKLiMgAl2Si3O10F2
VoloshiniteRb(LiAl1.51.5)(Al0.5Si3.5)O10F2
Wonesite(Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4
YangzhumingiteKMg2.5(Si4O10)F2
ZinnwalditeKLiFe2+Al(AlSi3O10)(F,OH)2

Common Associates

Associated Minerals Based on Photo Data:
Quartz1,167 photos of Muscovite associated with Quartz on mindat.org.
Albite1,013 photos of Muscovite associated with Albite on mindat.org.
Aquamarine882 photos of Muscovite associated with Aquamarine on mindat.org.
Fluorite817 photos of Muscovite associated with Fluorite on mindat.org.
Fluorapatite652 photos of Muscovite associated with Fluorapatite on mindat.org.
Spessartine415 photos of Muscovite associated with Spessartine on mindat.org.
Schorl392 photos of Muscovite associated with Schorl on mindat.org.
Scheelite384 photos of Muscovite associated with Scheelite on mindat.org.
Microcline349 photos of Muscovite associated with Microcline on mindat.org.
Smoky Quartz307 photos of Muscovite associated with Smoky Quartz on mindat.org.

Related Minerals - Nickel-Strunz Grouping

9.EC.05MinnesotaiteFe2+3Si4O10(OH)2
9.EC.05TalcMg3Si4O10(OH)2
9.EC.05WillemseiteNi3Si4O10(OH)2
9.EC.10FerripyrophylliteFe3+Si2O5(OH)
9.EC.10PyrophylliteAl2Si4O10(OH)2
9.EC.15BoromuscoviteKAl2(BSi3O10)(OH)2
9.EC.15CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
9.EC.15Chernykhite(Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2
9.EC.15Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4
9.EC.15NanpingiteCsAl2(AlSi3O10)(OH,F)2
9.EC.15ParagoniteNaAl2(AlSi3O10)(OH)2
9.EC.15RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
9.EC.15Tobelite(NH4,K)Al2(AlSi3O10)(OH)2
9.EC.15AluminoceladoniteK(Mg,Fe2+)Al(Si4O10)(OH)2
9.EC.15ChromphylliteK(Cr,Al)2(AlSi3O10)(OH,F)2
9.EC.15FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
9.EC.15FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
9.EC.15ChromceladoniteK(Mg,Fe2+)(Cr,Al)(Si4O10)(OH)2
9.EC.15TainioliteKLiMg2(Si4O10)F2
9.EC.15Ganterite(Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2
9.EC.20AnniteKFe2+3(AlSi3O10)(OH)2
9.EC.20EphesiteLiNaAl2(Al2Si2O10)(OH)2
9.EC.20HendricksiteK(Zn,Mg,Mn2+)3(AlSi3O10)(OH)2
9.EC.20Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2
9.EC.20NorrishiteKLiMn3+2(Si4O10)O2
9.EC.20PhlogopiteKMg3(AlSi3O10)(OH)2
9.EC.20PolylithioniteKLi2Al(Si4O10)(F,OH)2
9.EC.20PreiswerkiteNaMg2Al(Al2Si2O10)(OH)2
9.EC.20SiderophylliteKFe2+2Al(Al2Si2O10)(OH)2
9.EC.20TetraferriphlogopiteKMg3(Fe3+Si3O10)(OH,F)2
9.EC.20FluorotetraferriphlogopiteKMg3(Fe3+Si3O10)F2
9.EC.20Wonesite(Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4
9.EC.20EastoniteKMg2Al(Al2Si2O10)(OH)2
9.EC.20TetraferrianniteKFe2+3((Fe3+,Al)Si3O10)(OH)2
9.EC.20TrilithioniteK(Li1.5Al1.5)(AlSi3O10)(F,OH)2
9.EC.20FluoranniteKFe2+3(AlSi3O10)(F,OH)2
9.EC.20ShirokshiniteKNaMg2(Si4O10)F2
9.EC.20ShirozuliteK(Mn2+,Mg)3(AlSi3O10)(OH)2
9.EC.20SokolovaiteCsLi2Al(Si4O10)F2
9.EC.20AspidoliteNaMg3(AlSi3O10)(OH)2
9.EC.20FluorophlogopiteKMg3(AlSi3O10)(F,OH)2
9.EC.20UM2004-49-SiO:AlCsFHKLi(Cs,K)(Al,Li)2.6((Si,Al)4O10)(F,OH)2
9.EC.20Suhailite(NH4)Fe2+3(AlSi3O10)(OH)2
9.EC.20YangzhumingiteKMg2.5(Si4O10)F2
9.EC.20OrloviteKLi2Ti(Si4O10)OF
9.EC.20OxyphlogopiteK(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2
9.EC.25Brammallite(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
9.EC.30MargariteCaAl2(Al2Si2O10)(OH)2
9.EC.35Anandite(Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2
9.EC.35BityiteLiCaAl2(AlBeSi2O10)(OH)2
9.EC.35ClintoniteCa(Mg,Al)3(Al3SiO10)(OH)2
9.EC.35Kinoshitalite(Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2
9.EC.35Ferrokinoshitalite(Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2
9.EC.35Oxykinoshitalite(Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2
9.EC.35FluorokinoshitaliteBaMg3(Al2Si2O10)F2
9.EC.40Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
9.EC.40Kurumsakite(Zn,Ni,Cu)8Al8V5+2Si5O35 · 27H2O (?)
9.EC.40Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
9.EC.40NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
9.EC.40VolkonskoiteCa0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 · 4H2O
9.EC.40Yakhontovite(Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2O
9.EC.45HectoriteNa0.3(Mg,Li)3(Si4O10)(F,OH)2
9.EC.45SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
9.EC.45SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
9.EC.45SpadaiteMgSiO2(OH)2 · H2O (?)
9.EC.45Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
9.EC.45SwineforditeLi(Al,Li,Mg)4((Si,Al)4O10)2(OH,F)4 · nH2O
9.EC.45ZincsiliteZn3(Si4O10)(OH)2 · 4H2O
9.EC.45FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
9.EC.50VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O
9.EC.55Baileychlore(Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8
9.EC.55Chamosite(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
9.EC.55ClinochloreMg5Al(AlSi3O10)(OH)8
9.EC.55Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
9.EC.55FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8
9.EC.55Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8
9.EC.55Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
9.EC.55Orthochamosite(Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
9.EC.55PennantiteMn2+5Al(AlSi3O10)(OH)8
9.EC.55SudoiteMg2Al3(Si3Al)O10)(OH)8
9.EC.55DonbassiteAl4.33(AlSi3O10)(OH)8
9.EC.55GlagoleviteNa(Mg,Al)6(AlSi3O10)(OH,O)8
9.EC.55BorocookeiteLi1+3xAl4-x(BSi3O10)(OH)8
9.EC.60AliettiteCa0.2Mg6((Si,Al)8O20)(OH)4 · 4H2O
9.EC.60Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
9.EC.60DozyiteMg7Al2(Al2Si4O15)(OH)12
9.EC.60HydrobiotiteK(Mg,Fe2+)6((Si,Al)8O20)(OH)4 · nH2O
9.EC.60Karpinskite(Ni,Mg)2Si2O5(OH)2 (?)
9.EC.60KulkeiteMg8Al(AlSi7O20)(OH)10
9.EC.60LunijianlaiteLi0.7Al6.2(AlSi7O20)(OH,O)10
9.EC.60Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
9.EC.60Saliotite(Li,Na)Al3(AlSi3O10)(OH)5
9.EC.60TosuditeNa0.5(Al,Mg)6((Si,Al)8O18)(OH)12 · 5H2O
9.EC.60BrinrobertsiteNa0.3Al4(Si4O10)2(OH)4 · 3.5 H2O
9.EC.65Macaulayite(Fe,Al)24Si4O43(OH)2
9.EC.70BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6
9.EC.75Ferrisurite(Pb,Ca)2.4Fe3+2(Si4O10)(CO3)1.7(OH)3 · nH2O
9.EC.75Surite(Pb,Ca)3(Al,Fe2+,Mg)2((Si,Al)4O10)(CO3)2(OH)2
9.EC.75Niksergievite(Ba,Ca)2Al3(AlSi3O10)(CO3)(OH)6 · nH2O
9.EC.80KegelitePb8Al4(Si8O20)(SO4)2(CO3)4(OH)8

Related Minerals - Hey's Chemical Index of Minerals Grouping

16.3.1LithositeK6Al4Si8O25 · 2H2O
16.3.2KaliophiliteKAlSiO4
16.3.3KalsiliteKAlSiO4
16.3.4LeuciteK(AlSi2O6)
16.3.5MicroclineK(AlSi3O8)
16.3.6OrthoclaseK(AlSi3O8)
16.3.7SanidineK(AlSi3O8)

Related Minerals - Dana Grouping (8th Ed.)

71.2.2a.2ParagoniteNaAl2(AlSi3O10)(OH)2
71.2.2a.3Chernykhite(Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2
71.2.2a.4RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
71.2.2a.5Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
71.2.2a.6CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
71.2.2a.7Tobelite(NH4,K)Al2(AlSi3O10)(OH)2
71.2.2a.8NanpingiteCsAl2(AlSi3O10)(OH,F)2
71.2.2a.9BoromuscoviteKAl2(BSi3O10)(OH)2
71.2.2a.10Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4

Synonyms of Muscovite

Other Language Names for Muscovite

Varieties of Muscovite

Adamsite

A variety of Muscovite, classed as a Margarodite.

Not to be confused with Adamsite-(Y).

Originally described from Derby, Orleans Co., Vermont, USA.

Al-illite-hydromica

Variety of Illite very low in K and high in water.

Alurgite

Name introduced by Breithaupt in 1865 and characterized by Penfield in 1893 (vide Knurr and Bailey, 1986). Placed by W. T. Schaller (1950) as an intermediate between leucophyllite (now a synonym of aluminoceladonite) and muscovite. Study of Knurr and Bail...

Ammersooite

A variety of Illite capable of fixing Potassium, from Dutch fields.

Astrolite

Spherical aggregates composed of radiating tabular crystals.

Originally described from Pelz quarry, Diabase quarries, Neumark, Reichenbach, Vogtland, Saxony, Germany.

Avalite

A chromian variety of Illite.
Originally described from Mt Avala, Belgrade, Serbia.

Barian Muscovite

A barium-rich variety of muscovite.

Barian-Chromian Muscovite

A barium- and chromium-bearing muscovite.

Barium-Vanadium-Muscovite

A barian vanadian variety of Muscovite.

Originally reported from Silver Knob, Fish Camp, Yosemite Valley, Mariposa Co., California, USA.

Batchelorite

A green slaty mineral, originally described by W. F. Petterd (1910) from the Mt. Lyell mine, Tasmania. Re-analysis of visually identical material from the same locality by Bothwell & Moss (1957) showed it to be a slightly Cr-bearing muscovite.

Brammallite

A sodium-rich illite. [AmMin 29:73]

Chacaltaîte

A green chlorite-like varety of muscovite.

Originally reported from Chacaltaya mine, Mt. Huayna Potosí (Huaina Potosi), Murillo Province, La Paz Department, Bolivia.

Chromian Sericite

A chromium-bearing variety of Sericite.

Damourite

Very fine-grained, compact muscovite - with a greasy feel, "serpentine-like," and often a fibrous appearance when viewed from a certain direction.

Ferrimuscovite

Fuchsite

Greenish variety of muscovite, high in chromium (trivalent Cr replaces Al in the crystal structure). Note that trivalent V can also cause a greenish colour in muscovite (cf. roscoelite).

Originally reported from Schwarzenstein Mt., Zemmgrund, Ziller vall...

Gieseckite

Pseudomorphs of muscovite after an unknown mineral.

Compare also liebenerite.

Gilbertite

Compact variety of Muscovite. The original chemical analysis of material from Stenagwyn, Cornwall indicated no potassium or sodium. There were major amounts of silica and alumina, and minor amounts of CaO, MgO, and FeO. Thomson seems to have doubted the v...

Illite

Mica Group

.

This clay-like series is essentially a K-deficient
muscovite, but frequently contains randomly sequenced montmorillonite/beidellite layers. Illite is dioctahedral, although some references are known which incorrectly refer to "illite" as a s...

Illite Jade

A dense variety of illite with reddish banding (caused by microscopic inclusions of hematite), which is used for carving and as an ornamental stone. In addition to hematite, the material usually also contains small quantities of impurities such as quartz,...

Leverrierite

A kaolinite-group clay.
Originally reported from Saint-Etienne, Loire, Rhône-Alpes, France.

Liebenerite

Muscovite pseudomorphous after nepheline, possibly also after cordierite.

Compare also gieseckite.

Lithium Muscovite (of Levinson)

A lithian muscovite with 3-4% Li2O

Oellacherite

A green to colorless, Ba-bearing variety of muscovite intermediate in chemical composition between true mica and brittle mica.

Persbergite

Muscovite pseudomorphous after nepheline.

Not to be confused with pajsbergite.

Pig's Egg

A pseudomorph of fine-grained Muscovite ("Sericite") after Orthoclase, found in kaolinized granite.

Rubidian Muscovite

Rubidium-bearing muscovite with Rb2O contents of 1 and more mass%. Usual rock forming mineral in late stages of the evolution of many granitic rare-metal (Ta,Be,Cs) natro-lithian pegmatites.

Schernikite

A pink variety of Muscovite, described by Bowman (1902).

Sericite

A term for a fine-grained white, pale green to oily greenish mica, mainly Muscovite (rarely Paragonite).

Star muscovite

Muscovite forming star-shaped crystal aggregates.
Especially nice specimens come from pegmatites in the Jenipapo district, Minas Gerais, Brazil.

Vanadian Muscovite

A vanadian variety of Muscovite. Intermediate member of Muscovite-Roscoelite solid solutions.

Verdite

Trade name for a green ornamental stone, primarily an impure Fuchsite mica originally from North Kaap river, Kaap Station, South Africa.

Consists primarily of Fuchsite with minor Albite, Chlorite Group, Corundum, Diaspore, Margarite, Quartz, Rutile and T...

Wilsonite

Described as an Mn-bearing "sericite" or muscovite pseudomorph after scapolite. Hey lists it as an aluminosilicate of Mg and K.

Zincian Muscovite

Zn-bearing variety from the "Mixed Series" formation, Nežilovo, Macedonia. Associates, i.a., with ferricoronadite.

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Muscovite in petrology

An essential component of (items highlighted in red)
Common component of (items highlighted in red)

References for Muscovite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Woodard, H.H. (1951) The Geology and Paragenesis of the Lord Hill pegmatite, Stoneham, Maine. American Mineralogist: 36: 869-883.
Heinrich, E.W., Levinson, A.A. (1953) Studies in the mica group: mineralogy of the rose muscovites. American Mineralogist: 38: 25-49.
Yoder, H.S., Eugster, H.P. (1955) Synthetic and natural muscovites. Geochimica et Cosmochimica Acta: 8: 225-280.
Nicol, A.W. (1964) Topotactic transformation of muscovite under mild hydrothermal conditions. Clays and Clay Minerals: 12: 11-19.
Güven, N. (1967) The crystal structure of 2M1 phengite and 2M1 muscovite. Carnegie Inst. Washington Year Book: 66: 487-492.
Brearley, A.J. (1986) An electron optical study of muscovite breakdown in pelitic xenoliths during pyrometamorphism. Mineralogical Magazine: 50: 385-397.
Guggenheim, S., Chang, Y.-H., and Koster van Groos, A.F. (1987) Muscovite dehydroxylation: High-temperature studies. American Mineralogist: 72: 537-550.
Guidotti, C.V., Mazzoli, C., Sassi, F.P., Blencoe, J.G. (1992) Compositional controls on the cell dimensions of 2M1 muscovite and paragonite. European Journal of Mineralogy: 4: 283-292.
Gaines, R.V., Skinner, H.C.W., Foord, E.E., Mason, B., Rosenzweig, A. (1997) Dana's New Mineralogy: The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana: 1448.
Rieder, M., Cavazzani, G., D'Yakonov, Y.S., Frank-Kamenetskii, V.A., Gottardi, G., Guggenheim, S., Koval, P.V., Müller, G., Neiva, A.M.R., Radaslovich, E.W., Robert, J.-L., Sassi, F.P., Takeda, H., Weiss, Z., Wones, D.R. (1998) Nomenclature of the micas. The Canadian Mineralogist: 36: 905-912.
Busigny, V., Cartigny, P., Philippot, P., Javoy, M. (2003) Ammonium quantification in muscovite by infrared spectroscopy. Chemical Geology: 198: 21-31.

Internet Links for Muscovite

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https://www.mindat.org/min-2815.html
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Specimens:
The following Muscovite specimens are currently listed for sale on minfind.com.

Significant localities for Muscovite

Showing 23 significant localities out of 25,649 recorded on mindat.org.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada
 
  • Québec
    • Abitibi-Témiscamingue
      • La Vallée-de-l'Or RCM
        • Réservoir-Dozois
Olivier Langelier Collection
Peru
 
  • Ancash Department
    • Pallasca Province
      • Pampas District
Mineralogical Record 28, No. 4 (1997); collections of Rock Currier, Jack Crowley, Jaroslav Hyrsl and Alfredo Petrov.
Switzerland
 
  • Wallis (Valais)
    • Martigny
      • Mont Chemin
UK
 
  • Wales
    • Carmarthenshire
[Illite var: Brammallite] DAN Earth Sci. 208 (1973), 157; CM 36 (1998), 905
USA (TL)
 
  • California
Bowen, O.E., Jr. & C.H. Gray, Jr. (1957), Mines and mineral deposits of Mariposa County, California: California Journal of Mines and Geology: 53(1&2): 34-343; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 425.
    • San Luis Obispo Co.
      • Santa Lucia Mts (Santa Lucia Range)
        • San Simeon
Ron Layton collection
  • Connecticut
    • Fairfield Co.
      • Redding (Reading)
        • Branchville
Cameron et al (1954) USGS Prof Paper 255; Shainin (1946); Rocks & Minerals (1995) 70:396-409
    • Hartford Co.
      • Glastonbury
        • South Glastonbury
Rocks & Min 74:121 (1999); Rocks and Minerals (1999) 74:110-121
    • Middlesex Co.
      • East Hampton (Chatham)
LMSCC Newsletter, Sept. 2005 Harold Moritz collection, 1991-2009
      • Haddam
        • Haddam Neck
Mineralogical Magazine 1902 13 : 97-121.; Scovil, Jeffrey A. (1992): Famous Mineral Localities: the Gillette Quarry, Haddam Neck, Connecticut. (Mineralogical Record, 23(1):19-28.); Cameron, Eugene N. and others. (1954) PEGMATITE INVESTIGATIONS 1942-45 NEW ENGLAND. U.S. Geological Survey, Professional Paper 255.
[var: Schernikite] Adam Berlutti collection
      • Portland
        • Collins Hill
          • Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries)
Cameron, Eugene N., Larrabee, David M., McNair, Andrew H., Page, James T., Stewart, Glenn W., and Shainin, Vincent E. (1954): Pegmatite Investigations 1942-45 New England; USGS Professional Paper 255: 333-338.; Sterrett, Douglas B. (1923), Mica Deposits Of The United States, USGS Bulletin 740: 65-67.
Januzzi, Ronald. (1976), Mineral Localities of Connecticut and Southeastern New York State. Taylor Associates/Mineralogical Press, Danbury.
  • Illinois
    • Calhoun Co.
      • Gilead
[Illite] GSA Bulletin; August 2001; v. 113; no. 8; p. 1092-1104
  • Maine
    • Sagadahoc Co.
      • Topsham
[var: Schernikite] Cliff Trebilcock collection
  • North Carolina
    • Catawba Co.
      • Hickory
K. Wood collection
    • Mitchell Co.
      • Spruce Pine District
        • Spruce Pine
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
  • Pennsylvania
    • Delaware Co.
      • Middletown Township
Gordon, Mineralogy of Pennsylvania, 1922 p. 190
  • South Dakota
    • Pennington Co.
      • Keystone District
        • Keystone
Dana 6: 1088; Rocks & Minerals: 10: 121-122,146-147.; USGS Bull 380D; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Norton, James J. (1964) Pegmatites and other Precambrian Rocks in the Southern Black Hills; Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E.
  • Texas
    • Burnet Co.
F Roberts, 2006
Mineral and/or Locality  
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