Muscovite Mineral Data + Say MUSCOVITE

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General Muscovite Information

Help on Chemical  Formula: Chemical Formula: KAl2(Si3Al)O10(OH,F)2
Help on Composition: Composition: Molecular Weight = 398.71 gm
   Potassium   9.81 %  K    11.81 % K2O
   Aluminum   20.30 %  Al   38.36 % Al2O3
   Silicon    21.13 %  Si   45.21 % SiO2
   Hydrogen    0.46 %  H     4.07 % H2O
   Oxygen     47.35 %  O
   Fluorine    0.95 %  F     0.95 % F
                -   %  F    -0.40 % -O=F2
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KAl3Si3O10(OH)1.8F0.2
Help on Environment: Environment: Granites and pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1850
Help on Locality: Locality: Common world wide. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From Muscovy glass, alluding to the Russian province of Muscovy.
Help on Synonym: Synonym: Binnite (Ba)
  Fuchsite (Cr)
  Isinglass
  Potash Mica
 

Muscovite Image

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Muscovite   Fluorapatite   Beryl   Apatite

Comments: Pink crystals of fluorapatite with pale blue beryl (aquamarine) on books of muscovite crystals.
Location: Nagar area, Gilgit district, Northern Areas, Pakistan. Scale: 3 x 3 cm.
© Dan Weinrich

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Muscovite

Comments: Pseudo-hexagonal crystalline aggregate of muscovite.
Location: Conselheiro Pena, Minas Gerais, Brazil. Scale: Crystal size 2 cm.
© Dave Barthelmy

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Muscovite

Comments: Seams of green muscovite var. fuchsite in quartz matrix with minor pyrite crystals.
Location: Wolfe's Neck locality, Freeport, Cumberland Co., Maine, USA. Scale: 7x5x4 cm.
© John Betts - Fine Minerals

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Muscovite   Aluminoceladonite

Comments: Large, 1cm, purple crystals of muscovite/leucophyllite, (var. alurgite which is an intermediate composition to muscovite and leucophyllite (aluminoceladonite).
Location: Ultevis, Sweden. Scale: 5x3.5x3cm.
© Tom Loomis / Dakota Matrix

Muscovite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5747:1:2.2203
Help on Cell Dimensions: Cell Dimensions: a = 5.19, b = 9.03, c = 20.05, Z = 4; beta = 95.5° V = 935.33 Den(Calc)= 2.83
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.32(1), 9.95(0.95), 2.57(0.55),
Help on Forms: Forms:

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Forms: [ 2 2 1] [ 1 1 1] [ 0 1 0] [ 0 0 1]

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Richardson S M , Richardson J W , American Mineralogist , 67 (1982) p.69-75, Crystal structure of a pink muscovite from Archer s Post, Kenya: Implications, for reverse pleochroism in dioctahedral micas

View Additional jPOWD Structure files for Muscovite
[1] [11] [12] [13] [14] [15] [16] [17] [2] [20] [21] [3] [4] [5] [6] [7] [8]
 

Physical Properties of Muscovite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: White, Gray, Silver white, Brownish white, Greenish white.
Help on Density: Density: 2.77 - 2.88, Average = 2.82
Help on Diaphaniety: Diaphaniety: Transparent to translucent
Help on Fracture: Fracture: Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.
Help on Habit: Habit: Foliated - Two dimensional platy forms.
Help on Habit: Habit: Massive - Lamellar - Distinctly foliated fine-grained forms.
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Muscovite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2073,KPDmeas= 0.2077,KC= 0.2109
Help on Optical Data: Optical Data: Biaxial (?), a=1.552-1.574, b=1.582-1.61, g=1.586-1.616, bire=0.0340-0.0420, 2V(Calc)=38-42, 2V(Meas)=30-47. Dispersion weak to distinct, r > v.
Help on Pleochroism (x): Pleochroism (x): colorless or robins egg blue.
Help on Pleochroism (y): Pleochroism (y): colorless, very pale green, yellow, or pale yellowish green.
Help on Pleochroism (z): Pleochroism (z): colorless, pale green, blue green, or bright chrome green.
 

Calculated Properties of Muscovite

Help on Electron Density: Electron Density:

relectron=2.81 gm/cc
note: rMuscovite =2.83 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.0101
Boson Index = 0.9899
Help on Photoelectric: Photoelectric:

PEMuscovite = 2.39 barns/electron
U=PEMuscovite x relectron= 6.72 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 140.52 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Muscovite - barely detectable

 

Muscovite Classification

Help on  Dana Class: Dana Class: 71.2.2a.1 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.2)with 2:1 Layers
  (71.2.2a)Mica Group (Muscovite subgroup)
 
71.2.2a.1 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m
 
71.2.2a.2 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono
 
71.2.2a.3 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m
 
71.2.2a.4 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m
 
71.2.2a.5 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m
 
71.2.2a.6 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m
 
71.2.2a.6b Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m
 
71.2.2a.6c Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m
 
71.2.2a.6d Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m
 
71.2.2a.6e Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2
 
71.2.2a.7 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m
 
71.2.2a.8 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m
 
71.2.2a.9 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m
 
71.2.2a.10 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m
 
71.2.2a.11 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m
 
71.2.2a.12 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: VIII/H.10-70 VIII - Silicates
  VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups
  VIII/H.10 - Mica group, Muscovite series
 
VIII/H.10-10 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m
 
VIII/H.10-20 Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m
 
VIII/H.10-30 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m
 
VIII/H.10-35 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2
 
VIII/H.10-40 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m
 
VIII/H.10-50 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono
 
VIII/H.10-60 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m
 
VIII/H.10-70 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m
 
VIII/H.10-80 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m
 
VIII/H.10-90 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m
 
VIII/H.10-95 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m
 
VIII/H.10-100 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m
 
VIII/H.10-110 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m
 

Other Muscovite Information

Help on References: References: NAME( ODonoghue90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Muscovite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - CalTech Mineral Spectroscopy 8 - Crocoite.com Mineral Locations 9 - EUROmin Project 10 - Franklin Minerals(Palache) 11 - Glendale Community College 12 -Google Images 13 -Google Scholar 14 -Handbook of Mineralogy (MinSocAm) 15 -Handbook of Mineralogy (UofA) 16 - HyperPhysics 17 -MinDAT 18 -MinMax(Deutsch) 19 -MinMax(English) 20 -Mineralienatlas (Deutsch) 21 - Minerals in Thin Section-University of North Carolina 22 -Minerals in Thin Sections-Humboldt State 23 - Minerals of Wisconsin 24 - Philatelic Mineralogy 25 -QUT Mineral Atlas 26 - Scandinavian mineral gallery 27 - Thin Sections - Brock University 28 - UCLA - Petrography Thin-Sections 29 - University of Manchester - Mineral Structure 30 -University of Minnesota 31 - WWW-MINCRYST 32 -École des Mines de Paris

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Muscovite

KAl2(Si3Al)O10(OH,F)2
Dana No: 71.2.2a.1 Strunz No: VIII/H.10-70
Locality:

 

Notes:

 

 
   
 
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