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Muscovite

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Formula:
KAl
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
System:MonoclinicColour:White to colorless, ...
Hardness:
Member of:Mica Group
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).

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. Currently in public beta-test.

Classification of Muscovite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Explanation of status:Officially approved by the Mica Subcommittee 1998.
Strunz 8th edition ID:8/H.10-70
Nickel-Strunz 10th (pending) edition ID:9.EC.15

9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
Dana 7th edition ID:71.2.2.1
Dana 8th edition ID:71.2.2a.1

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
Hey's CIM Ref.:16.3.8

16 : Silicates Containing Aluminum and other Metals
3 : Aluminosilicates of K
mindat.org URL:http://www.mindat.org/min-2815.html
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Occurrences of Muscovite

Geological Setting:Muscovite is common in many different rock types as a primary mineral.

Physical Properties of Muscovite

Lustre:Vitreous, Silky, Pearly
Diaphaneity (Transparency):Transparent, Translucent
Colour:White to colorless, silvery-white, and tinged various colors by impurities.
Streak:White
Hardness (Mohs):
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 (measured):2.77 - 2.88 g/cm3
Density (calculated):2.83 g/cm3

Crystallography of Muscovite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b
Cell Parameters:a = 5.199Å, b = 9.027Å, c = 20.106Å
β = 95.78°
Ratio:a:b:c = 0.576 : 1 : 2.227
Unit Cell Volume:V 938.80 ų (Calculated from Unit Cell)
Z:4
Morphology:Crystals uncommon, tabular {001} with rhombic to hexagonal outlines, often bound by {221}, {111} and {010} (hkl refer to -2M1 polytype). Less common as prismatic, parallel to [001], with a crude hexagonal cross section. Most typically found as "books" and as flaky grains in various rocks. Sometimes in plumose aggregates.
Twinning:Mica law twins common [310] forming six pointed stars, less common with the composition plane perpendicular to {001} (hkl refer to -2M1 polytype).
Comment:Several monoclinic and triclinic polytypes are known. Cell data given for the -2M1 polytype (space group C2/c).
Crystal Atlas:
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Muscovite no.7 - Goldschmidt (1913-1926)
Muscovite no.12 - Goldschmidt (1913-1926)

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction:
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Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction:
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.

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°
Maximum Birefringence:δ = 0.035 - 0.042

Chart 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:
KAl
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
Simplified for copy/paste:KAl2(AlSi3O10)(OH)2
Essential elements:Al, H, K, O, Si
All elements listed in formula:Al, H, K, O, Si
Common Impurities:Cr,Li,Fe,V,Mn,Na,Cs,Rb,Ca,Mg,H2O

Relationship of Muscovite to other Species

Series:Forms a series with Paragonite (see here)
Forms a series with Celadonite (see here)
Member of:Mica Group
Other Members of Group:

- +
Aluminoceladonite
K(Mg,Fe
2+
 
)Al(Si
 
4
O
 
10
)(OH)
 
2
Anandite
(Ba,K)(Fe
2+
 
,Mg)
 
3
((Si,Al,Fe)
 
4
O
 
10
)(S,OH)
 
2
Annite
KFe
2+
3
(AlSi
 
3
O
 
10
)(OH)
 
2
Annite-Phlogopite Series
Aspidolite
NaMg
 
3
(AlSi
 
3
O
 
10
)(OH)
 
2
Balestraite
KLi
 
2
V
5+
 
Si
 
4
O
 
12
Biotite
Bityite
LiCaAl
 
2
(AlBeSi
 
2
O
 
10
)(OH)
 
2
Boromuscovite
KAl
 
2
(BSi
 
3
O
 
10
)(OH)
 
2
Brammallite
(Na,H
 
3
O)(Al,Mg,Fe)
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
Celadonite
K(Mg,Fe
2+
 
)Fe
3+
 
(Si
 
4
O
 
10
)(OH)
 
2
Chernykhite
(Ba,Na)(V
3+
 
,Al,Mg)
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
Chromceladonite
K(Mg,Fe
2+
 
)(Cr,Al)(Si
 
4
O
 
10
)(OH)
 
2
Chromphyllite
K(Cr,Al)
 
2
(AlSi
 
3
O
 
10
)(OH,F)
 
2
Clintonite
Ca(Mg,Al)
 
3
(Al
 
3
SiO
 
10
)(OH)
 
2
Eastonite
KMg
 
2
Al(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Ephesite
LiNaAl
 
2
(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Ferro-aluminoceladonite
K(Fe
2+
 
,Mg)(Al,Fe
3+
 
)(Si
 
4
O
 
10
)(OH)
 
2
Ferroceladonite
K(Fe
2+
 
,Mg)(Fe
3+
 
,Al)(Si
 
4
O
 
10
)(OH)
 
2
Ferrokinoshitalite
(Ba,K)(Fe
2+
 
,Mg)
 
3
(Al
 
2
Si
 
2
O
 
10
)(OH,F)
 
2
Fluorannite
KFe
2+
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
Fluorophlogopite
KMg
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
Ganterite
(Ba,Na,K)(Al,Mg)
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
Glauconite
(K,Na)(Fe
3+
 
,Al,Mg)
 
2
(Si,Al,Fe
3+
 
)
 
4
O
 
10
)(OH)
 
2
Hendricksite
K(Zn,Mg,Mn
2+
 
)
 
3
(AlSi
 
3
O
 
10
)(OH)
 
2
Illite
K
 
0.65
Al
 
2.0
[Al
 
0.65
Si
 
3.35
O
 
10
](OH)
 
2
Kinoshitalite
(Ba,K)(Mg,Mn
2+
 
,Al)
 
3
(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Lepidolite
Luanshiweiite
KLiAl
 
1.5
□0
 
.5
(Si
 
3.5
Al
 
0.5
)O
 
10
(OH,F)
 
2
Margarite
CaAl
 
2
(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Masutomilite
(K,Rb)(Li,Mn
3+
 
,Al)
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
Montdorite
(K,Na)
 
2
(Fe
2+
 
,Mn
2+
 
,Mg)
 
5
(Si
 
4
O
 
10
)
 
2
(OH,F)
 
4
Muscovite-Celadonite Series
Nanpingite
CsAl
 
2
(AlSi
 
3
O
 
10
)(OH,F)
 
2
Natro-glauconite
(Na,K)(Fe
3+
 
,Al,Mg)
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
Norrishite
KLiMn
3+
2
(Si
 
4
O
 
10
)O
 
2
Oxykinoshitalite
(Ba,K)(Mg,Ti,Fe
3+
 
,Fe
2+
 
)
 
3
((Si,Al)
 
4
O
 
10
)(O,OH,F)
 
2
Oxyphlogopite
K(Mg,Ti,Fe)
 
3
[(Si,Al)
 
4
O
 
10
](O,F)
 
2
Paragonite
NaAl
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
Phengite
Phlogopite
KMg
 
3
(AlSi
 
3
O
 
10
)(OH,F)
 
2
Polylithionite
KLi
 
2
Al(Si
 
4
O
 
10
)(F,OH)
 
2
Preiswerkite
NaMg
 
2
Al(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Roscoelite
K(V
3+
 
,Al)
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
Shirokshinite
KNaMg
 
2
(Si
 
4
O
 
10
)F
 
2
Shirozulite
K(Mn
2+
 
,Mg)
 
3
(AlSi
 
3
O
 
10
)(OH)
 
2
Siderophyllite
KFe
2+
2
Al(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
Sokolovaite
CsLi
 
2
Al(Si
 
4
O
 
10
)F
 
2
Suhailite
(NH
 
4
)Fe
2+
3
(AlSi
 
3
O
 
10
)(OH)
 
2
Tainiolite
KLiMg
 
2
(Si
 
4
O
 
10
)F
 
2
Tetraferriannite
KFe
2+
3
((Fe
3+
 
,Al)Si
 
3
O
 
10
)(OH)
 
2
Tetraferriphlogopite
KMg
 
3
(Fe
3+
 
Si
 
3
O
 
10
)(OH,F)
 
2
Tobelite
(NH
 
4
,K)Al
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
Trilithionite
K(Li,Al)
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
Voloshinite
Rb(LiAl
 
1.5
 
1.5
)(Al
 
0.5
Si
 
3.5
)O
 
10
F
 
2
Wonesite
(Na,K)(Mg,Fe,Al)
 
6
((Al,Si)
 
4
O
 
10
)
 
2
(OH,F)
 
4
Yangzhumingite
KMg
 
2.5
(Si
 
4
O
 
10
)F
 
2
Zinnwaldite
KLiFe
2+
 
Al(AlSi
 
3
O
 
10
)(F,OH)
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
9.EC.05Minnesotaite
(Fe,Mg)
 
3
(Si
 
4
O
 
10
)(OH)
 
2
9.EC.05Talc
Mg
 
3
(Si
 
4
O
 
10
)(OH)
 
2
9.EC.05Willemseite
(Ni,Mg)
 
3
(Si
 
4
O
 
10
)(OH)
 
2
9.EC.10Ferripyrophyllite
Fe
3+
2
(Si
 
4
O
 
10
)(OH)
 
2
9.EC.10Pyrophyllite
Al
 
2
(Si
 
4
O
 
10
)(OH)
 
2
9.EC.15Boromuscovite
KAl
 
2
(BSi
 
3
O
 
10
)(OH)
 
2
9.EC.15Celadonite
K(Mg,Fe
2+
 
)Fe
3+
 
(Si
 
4
O
 
10
)(OH)
 
2
9.EC.15Chernykhite
(Ba,Na)(V
3+
 
,Al,Mg)
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
9.EC.15Montdorite
(K,Na)
 
2
(Fe
2+
 
,Mn
2+
 
,Mg)
 
5
(Si
 
4
O
 
10
)
 
2
(OH,F)
 
4
9.EC.15Nanpingite
CsAl
 
2
(AlSi
 
3
O
 
10
)(OH,F)
 
2
9.EC.15Paragonite
NaAl
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
9.EC.15Roscoelite
K(V
3+
 
,Al)
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
9.EC.15Tobelite
(NH
 
4
,K)Al
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
9.EC.15Aluminoceladonite
K(Mg,Fe
2+
 
)Al(Si
 
4
O
 
10
)(OH)
 
2
9.EC.15Chromphyllite
K(Cr,Al)
 
2
(AlSi
 
3
O
 
10
)(OH,F)
 
2
9.EC.15Ferro-aluminoceladonite
K(Fe
2+
 
,Mg)(Al,Fe
3+
 
)(Si
 
4
O
 
10
)(OH)
 
2
9.EC.15Ferroceladonite
K(Fe
2+
 
,Mg)(Fe
3+
 
,Al)(Si
 
4
O
 
10
)(OH)
 
2
9.EC.15Chromceladonite
K(Mg,Fe
2+
 
)(Cr,Al)(Si
 
4
O
 
10
)(OH)
 
2
9.EC.15Tainiolite
KLiMg
 
2
(Si
 
4
O
 
10
)F
 
2
9.EC.15Ganterite
(Ba,Na,K)(Al,Mg)
 
2
(AlSi
 
3
O
 
10
)(OH)
 
2
9.EC.20Annite
KFe
2+
3
(AlSi
 
3
O
 
10
)(OH)
 
2
9.EC.20Ephesite
LiNaAl
 
2
(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
9.EC.20Hendricksite
K(Zn,Mg,Mn
2+
 
)
 
3
(AlSi
 
3
O
 
10
)(OH)
 
2
9.EC.20Masutomilite
(K,Rb)(Li,Mn
3+
 
,Al)
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
9.EC.20Norrishite
KLiMn
3+
2
(Si
 
4
O
 
10
)O
 
2
9.EC.20Phlogopite
KMg
 
3
(AlSi
 
3
O
 
10
)(OH,F)
 
2
9.EC.20Polylithionite
KLi
 
2
Al(Si
 
4
O
 
10
)(F,OH)
 
2
9.EC.20Preiswerkite
NaMg
 
2
Al(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
9.EC.20Siderophyllite
KFe
2+
2
Al(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
9.EC.20Tetraferriphlogopite
KMg
 
3
(Fe
3+
 
Si
 
3
O
 
10
)(OH,F)
 
2
9.EC.20Fluorotetraferriphlogopite
KMg
 
3
(Fe
3+
 
Si
 
3
O
 
10
)F
 
2
9.EC.20Wonesite
(Na,K)(Mg,Fe,Al)
 
6
((Al,Si)
 
4
O
 
10
)
 
2
(OH,F)
 
4
9.EC.20Eastonite
KMg
 
2
Al(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
9.EC.20Tetraferriannite
KFe
2+
3
((Fe
3+
 
,Al)Si
 
3
O
 
10
)(OH)
 
2
9.EC.20Trilithionite
K(Li,Al)
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
9.EC.20Fluorannite
KFe
2+
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
9.EC.20Shirokshinite
KNaMg
 
2
(Si
 
4
O
 
10
)F
 
2
9.EC.20Shirozulite
K(Mn
2+
 
,Mg)
 
3
(AlSi
 
3
O
 
10
)(OH)
 
2
9.EC.20Sokolovaite
CsLi
 
2
Al(Si
 
4
O
 
10
)F
 
2
9.EC.20Aspidolite
NaMg
 
3
(AlSi
 
3
O
 
10
)(OH)
 
2
9.EC.20Fluorophlogopite
KMg
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
9.EC.20UM2004-49-SiO:AlCsFHKLi
(Cs,K)(Al,Li)
 
2.6
((Si,Al)
 
4
O
 
10
)(F,OH)
 
2
9.EC.20Suhailite
(NH
 
4
)Fe
2+
3
(AlSi
 
3
O
 
10
)(OH)
 
2
9.EC.20Yangzhumingite
KMg
 
2.5
(Si
 
4
O
 
10
)F
 
2
9.EC.20Orlovite
KLi
 
2
Ti(Si
 
4
O
 
10
)OF
9.EC.20Oxyphlogopite
K(Mg,Ti,Fe)
 
3
[(Si,Al)
 
4
O
 
10
](O,F)
 
2
9.EC.25Brammallite
(Na,H
 
3
O)(Al,Mg,Fe)
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
9.EC.30Margarite
CaAl
 
2
(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
9.EC.35Anandite
(Ba,K)(Fe
2+
 
,Mg)
 
3
((Si,Al,Fe)
 
4
O
 
10
)(S,OH)
 
2
9.EC.35Bityite
LiCaAl
 
2
(AlBeSi
 
2
O
 
10
)(OH)
 
2
9.EC.35Clintonite
Ca(Mg,Al)
 
3
(Al
 
3
SiO
 
10
)(OH)
 
2
9.EC.35Kinoshitalite
(Ba,K)(Mg,Mn
2+
 
,Al)
 
3
(Al
 
2
Si
 
2
O
 
10
)(OH)
 
2
9.EC.35Ferrokinoshitalite
(Ba,K)(Fe
2+
 
,Mg)
 
3
(Al
 
2
Si
 
2
O
 
10
)(OH,F)
 
2
9.EC.35Oxykinoshitalite
(Ba,K)(Mg,Ti,Fe
3+
 
,Fe
2+
 
)
 
3
((Si,Al)
 
4
O
 
10
)(O,OH,F)
 
2
9.EC.35Fluorokinoshitalite
BaMg
 
3
(Al
 
2
Si
 
2
O
 
10
)F
 
2
9.EC.40Beidellite
(Na,Ca
 
0.5
)
 
0.3
Al
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
· nH
 
2
O
9.EC.40Kurumsakite
(Zn,Ni,Cu)
 
8
Al
 
8
V
5+
2
Si
 
5
O
 
35
· 27H
 
2
O (?)
9.EC.40Montmorillonite
(Na,Ca)
 
0.33
(Al,Mg)
 
2
(Si
 
4
O
 
10
)(OH)
 
2
· nH
 
2
O
9.EC.40Nontronite
Na
 
0.3
Fe
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
· nH
 
2
O
9.EC.40Volkonskoite
Ca
 
0.3
(Cr,Mg,Fe)
 
2
((Si,Al)
 
4
O
 
10
)(OH)
 
2
· 4H
 
2
O
9.EC.40Yakhontovite
(Ca,Na)
 
0.5
(Cu,Fe,Mg)
 
2
(Si
 
4
O
 
10
)(OH)
 
2
· 3H
 
2
O
9.EC.45Hectorite
Na
 
0.3
(Mg,Li)
 
3
(Si
 
4
O
 
10
)(F,OH)
 
2
9.EC.45Saponite
Ca
 
0.25
(Mg,Fe)
 
3
((Si,Al)
 
4
O
 
10
)(OH)
 
2
· nH
 
2
O
9.EC.45Sauconite
Na
 
0.3
Zn
 
3
((Si,Al)
 
4
O
 
10
)(OH)
 
2
· 4H
 
2
O
9.EC.45Spadaite
MgSiO
 
2
(OH)
 
2
· H
 
2
O (?)
9.EC.45Stevensite
(Ca,Na)
 
x
Mg
 
3-x
(Si
 
4
O
 
10
)(OH)
 
2
9.EC.45Swinefordite
Li(Al,Li,Mg)
 
4
((Si,Al)
 
4
O
 
10
)
 
2
(OH,F)
 
4
· nH
 
2
O
9.EC.45Zincsilite
Zn
 
3
(Si
 
4
O
 
10
)(OH)
 
2
· 4H
 
2
O
9.EC.45Ferrosaponite
Ca
 
0.3
(Fe
2+
 
,Mg,Fe
3+
 
)
 
3
((Si,Al)
 
4
O
 
10
)(OH)
 
2
· 4H
 
2
O
9.EC.50Vermiculite
(Mg,Fe,Al)
 
3
((Al,Si)
 
4
O
 
10
)(OH)
 
2
· 4H
 
2
O
9.EC.55Baileychlore
(Zn,Fe,Al,Mg)
 
6
((Si,Al)
 
4
O
 
10
)(OH)
 
8
9.EC.55Chamosite
(Fe
2+
 
,Mg)
 
5
Al(AlSi
 
3
O
 
10
)(OH)
 
8
9.EC.55Clinochlore
(Mg,Fe
2+
 
)
 
5
Al(AlSi
 
3
O
 
10
)(OH)
 
8
9.EC.55Cookeite
(Al
 
2
Li)Al
 
2
(AlSi
 
3
O
 
10
)(OH)
 
8
9.EC.55Franklinfurnaceite
Ca
 
2
Fe
3+
 
Mn
2+
3
Mn
3+
 
(Zn
 
2
Si
 
2
O
 
10
)(OH)
 
8
9.EC.55Gonyerite
(Mn
2+
 
,Mg)
 
5
Fe
3+
 
(Fe
3+
 
Si
 
3
O
 
10
)(OH)
 
8
9.EC.55Nimite
(Ni,Mg,Al)
 
6
((Si,Al)
 
4
O
 
10
)(OH)
 
8
9.EC.55Orthochamosite
(Fe
2+
 
,Mg,Fe
3+
 
)
 
5
Al(AlSi
 
3
O
 
10
)(OH,O)
 
8
9.EC.55Pennantite
Mn
2+
5
Al(AlSi
 
3
O
 
10
)(OH)
 
8
9.EC.55Sudoite
(Mg,Fe
2+
 
)
 
2
Al
 
3
(AlSi
 
3
O
 
10
)(OH)
 
8
9.EC.55Donbassite
Al
 
4.33
(AlSi
 
3
O
 
10
)(OH)
 
8
9.EC.55Glagolevite
Na(Mg,Al)
 
6
(AlSi
 
3
O
 
10
)(OH,O)
 
8
9.EC.55Borocookeite
Li
 
1+3x
Al
 
4-x
(BSi
 
3
O
 
10
)(OH)
 
8
9.EC.60Aliettite
Ca
 
0.2
Mg
 
6
((Si,Al)
 
8
O
 
20
)(OH)
 
4
· 4H
 
2
O
9.EC.60Corrensite
(Mg,Fe)
 
9
((Si,Al)
 
8
O
 
20
)(OH)
 
10
· nH
 
2
O
9.EC.60Dozyite
Mg
 
7
Al
 
2
(Al
 
2
Si
 
4
O
 
15
)(OH)
 
12
9.EC.60Hydrobiotite
K(Mg,Fe
2+
 
)
 
6
((Si,Al)
 
8
O
 
20
)(OH)
 
4
· nH
 
2
O
9.EC.60Karpinskite
(Ni,Mg)
 
2
Si
 
2
O
 
5
(OH)
 
2
(?)
9.EC.60Kulkeite
Mg
 
8
Al(AlSi
 
7
O
 
20
)(OH)
 
10
9.EC.60Lunijianlaite
Li
 
0.7
Al
 
6.2
(AlSi
 
7
O
 
20
)(OH,O)
 
10
9.EC.60Rectorite
(Na,Ca)Al
 
4
((Si,Al)
 
8
O
 
20
)(OH)
 
4
· 2H
 
2
O
9.EC.60Saliotite
(Li,Na)Al
 
3
(AlSi
 
3
O
 
10
)(OH)
 
5
9.EC.60Tosudite
Na
 
0.5
(Al,Mg)
 
6
((Si,Al)
 
8
O
 
18
)(OH)
 
12
· 5H
 
2
O
9.EC.60Brinrobertsite
Na
 
0.3
Al
 
4
(Si
 
4
O
 
10
)
 
2
(OH)
 
4
· 3.5 H
 
2
O
9.EC.65Macaulayite
(Fe,Al)
 
24
Si
 
4
O
 
43
(OH)
 
2
9.EC.70Burckhardtite
Pb
 
2
(Fe
3+
 
,Mn
3+
 
)Te
4+
 
(AlSi
 
3
O
 
10
)O
 
2
(OH)
 
2
· H
 
2
O
9.EC.75Ferrisurite
(Pb,Ca)
 
2.4
Fe
3+
2
(Si
 
4
O
 
10
)(CO
 
3
)
 
1.7
(OH)
 
3
· nH
 
2
O
9.EC.75Surite
(Pb,Ca)
 
3
(Al,Fe
2+
 
,Mg)
 
2
((Si,Al)
 
4
O
 
10
)(CO
 
3
)
 
2
(OH)
 
2
9.EC.75Niksergievite
(Ba,Ca)
 
2
Al
 
3
(AlSi
 
3
O
 
10
)(CO
 
3
)(OH)
 
6
· nH
 
2
O
9.EC.80Kegelite
Pb
 
8
Al
 
4
(Si
 
8
O
 
20
)(SO
 
4
)
 
2
(CO
 
3
)
 
4
(OH)
 
8
Related Minerals - Hey's Index Grouping:

- +
16.3.1Lithosite
K
 
6
Al
 
4
Si
 
8
O
 
25
· 2H
 
2
O
16.3.2Kaliophilite
KAlSiO
 
4
16.3.3Kalsilite
KAlSiO
 
4
16.3.4Leucite
K(AlSi
 
2
O
 
6
)
16.3.5Microcline
KAlSi
 
3
O
 
8
16.3.6Orthoclase
KAlSi
 
3
O
 
8
16.3.7Sanidine
KAlSi
 
3
O
 
8
Related Minerals - Dana Grouping):

- +
71.2.2.2Illite
K
 
0.65
Al
 
2.0
[Al
 
0.65
Si
 
3.35
O
 
10
](OH)
 
2
71.2.2.5Glauconite
(K,Na)(Fe
3+
 
,Al,Mg)
 
2
(Si,Al,Fe
3+
 
)
 
4
O
 
10
)(OH)
 
2
71.2.2.13Aspidolite
NaMg
 
3
(AlSi
 
3
O
 
10
)(OH)
 
2

Other Names for Muscovite

Synonyms:
AmmochrysosAmphilogiteAntoniteDidymiteMuscovy Glass
MuscowitowOncosine
Other Languages:
Catalan:Moscovita
Czech:Muskovit
Dutch:Muscoviet
Esperanto:Muskovito
Finnish:Muskoviitti
French:Muscovite
Argent des chats
Galician:Moscovita
German:Muskovit
Antonit
Astrolit
Frauenglas
Kaliglimmer
Muscovit
Muscowit
Hebrew:מוסקוביט
Hungarian:Muszkovit
Italian:Muscovite
Japanese:白雲母
Low Saxon:Muskovit
Polish:Muskowit
Portuguese:Moscovita
Russian:Серицит
Simplified Chinese:白云母
Slovak:Muskovit
Spanish:Moscovita
Antonita
Astrolita
Muscovita
Turkish:Muskovit
Varieties:
AdamsiteAl-illite-hydromicaAlurgiteAmmersooiteAstrolite
AvaliteBarian MuscoviteBarian-Chromian MuscoviteBarium-Vanadium-MuscoviteChacaltaîte
Chromian SericiteDamouriteFerrimuscoviteFuchsiteGieseckite
GilbertiteIlliteIllite JadeLeverrieriteLiebenerite
Lithian MuscoviteLithium Muscovite (of Levinson)MaripositeOellacheritePersbergite
PhengitePig's EggRubidian MuscoviteSchernikiteSericite
Star muscoviteVanadian MuscoviteVerditeWilsonite

Polytypes for Muscovite

Polytypes:
Muscovite-1MMuscovite-2M1Muscovite-2M2Muscovite-3T

Other Information

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

References for Muscovite

Reference List:

- +
Woodard, H.H. (1951) The Geology and Paragenesis of the Lord Hill pegmatite, Stoneham, Maine. American Mineralogist: 36: 869-883.

Heinrich, Eberhardt William & Alfred Abraham Levinson (1953), Studies in the mica group: mineralogy of the rose muscovites: American Mineralogist: 38: 25-49.

Yoder, H.S. and 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.

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.

European Journal of Mineralogy (1992): 4: 283.

Gaines, Richard V., H. Catherine, W. Skinner, Eugene E. Foord, Brian Mason, Abraham Rosenzweig (1997), Dana's New Mineralogy : The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana: 1448.

Canadian Mineralogist (1998): 36: 905-912.

Busigny, V., Cartigny, P., Philippot, P., and Javoy, M. (2003) Ammonium quantification in muscovite by infrared spectroscopy. Chemical Geology: 198: 21-31.

Best Localities for Muscovite

Best of Species:Muscovite

Internet Links for Muscovite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Muscovite details from Handbook of Mineralogy (PDF)
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  • Specimens:The following Muscovite specimens are currently listed for sale on minfind.com.

    Localities for Muscovite

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