Phlogopite Mineral Data

Phlogopite Mineral Data +

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General Phlogopite Information

Chemical Formula:

KMg3(Si3Al)O10(F,OH)2

Composition:

Molecular Weight = 419.25 gm

Potassium 9.33 % K 11.23 % K₂O

Magnesium 17.39 % Mg 28.84 % MgO

Aluminum 6.44 % Al 12.16 % Al₂O₃

Silicon 20.10 % Si 42.99 % SiO₂

Hydrogen 0.24 % H 2.15 % H₂O

Oxygen 41.98 % O

Fluorine 4.53 % F 4.53 % F

- % F -1.91 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KMg₃AlSi₃O₁₀F(OH)

Environment:

Contact and regional metamorphic limestones and dolomites. Ultramafic igneous rocks.

IMA Status:

Valid Species (Pre-IMA) 1841

Locality:

St. Lawrence Co., at Edwards, New York, USA. Link to MinDat.org Location Data.

Name Origin:

From the Greek flogopos - "resembling fire."

Synonym:

Magnesium Mica

Phlogopite Image

Images:

Phlogopite

Comments: Exceptionally well-crystallized wine-colored pseudo-hexagonal crystal of phlogopite on white calcite.
Location: Kalu Khan, Badakhshan, Afghanistan. Scale: 6 x 5.5 cm.
© Fabre Minerals

Images:

Phlogopite Serendibite

Comments: Blue serendibite, with golden colored phlogopite, in white marble.
Location: Near Johnsberg, Warren County, New York, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Phlogopite Lazurite

Comments: Gemmy brownish phlogopite crystals on blue lazurite (lapis) matrix with minor pyrite.
Location: Koksha Valley, Badakhshan Province, Afghanistan. Scale: 10 x 11.5 cm.
© Kevin Ward

Phlogopite Crystallography

Axial Ratios:

a:b:c =0.5752:1:2.2058

Cell Dimensions:

a = 5.31, b = 9.23, c = 20.36, Z = 4; beta = 99.3° V = 984.75 Den(Calc)= 2.83

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.998(1), 2.613(0.53), 3.382(0.33),

Forms:

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

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Crystal Structure:

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Hendricks S B , Jefferson M E , American Mineralogist , 24 (1939) p.729-771, Polymorphism of the micas with optical measurements

View Additional jPOWD Structure files for Phlogopite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [3] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [4] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [5] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [6] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [7] [70] [71] [72] [8] [9]

Physical Properties of Phlogopite

Cleavage:

[001] Perfect

Color:

Brown, Gray, Green, Yellow, Reddish brown.

Density:

2.7 - 2.9, Average = 2.8

Diaphaniety:

Transparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Micaceous - Platy texture with "flexible" plates.

Habit:

Scaly - Morphology like fish scales.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luminescence:

None.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Phlogopite

Gladstone-Dale:

CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2034,KPDmeas= 0.2055,KC= 0.2037

Optical Data:

Biaxial (-), a=1.53-1.573, b=1.557-1.617, g=1.558-1.618, bire=0.0280-0.0450, 2V(Calc)=16-20, 2V(Meas)=0-12. Dispersion weak to distinct, r < v.

Pleochroism (x):

colorless, pale yellow, orange, salmon pink, or brown. red brown.

Pleochroism (y):

brownish yellow, buff, reddish orange, pale reddish brown, or colorless.

Pleochroism (z):

brownish yellow, buff, reddish orange, reddish brown, or colorless.

Calculated Properties of Phlogopite

Electron Density:

r_electron=2.81 gm/cc
note: r_Phlogopite=2.83 gm/cc.

Fermion Index

Fermion Index = 0.02699
Boson Index = 0.97301

Photoelectric:

PE_Phlogopite= 2.30 barns/electron
U=PE_Phlogopite x r_electron= 6.46 barns/cc.

Radioactivity:

GRapi = 133.53 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Phlogopite - barely detectable

Phlogopite Classification

Dana Class:

71.2.2b.1 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2b)Mica Group (Biotite subgroup)

71.2.2b.1 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

71.2.2b.1a Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

71.2.2b.1b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

71.2.2b.2 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

71.2.2b.4 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

71.2.2b.5 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

71.2.2b.5a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

71.2.2b.6 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

71.2.2b.7 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono

71.2.2b.8 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

71.2.2b.8a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

71.2.2b.8b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono

71.2.2b.9 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

71.2.2b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

71.2.2b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

71.2.2b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

71.2.2b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

71.2.2b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m

71.2.2b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

71.2.2b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

71.2.2b.17 IMA2004-049! NaMg3(AlSi3)O10(OH)2 C 2/m 2/m

Strunz Class:

VIII/H.11-80 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.11 - Mica group, Biotite series

VIII/H.11-00* Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

VIII/H.11-10 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

VIII/H.11-20 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

VIII/H.11-30 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

VIII/H.11-35 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m

VIII/H.11-40 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

VIII/H.11-50 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

VIII/H.11-60 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

VIII/H.11-70 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

VIII/H.11-80 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

VIII/H.11-90 Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

VIII/H.11-100 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

VIII/H.11-102 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

VIII/H.11-105 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

VIII/H.11-110 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

VIII/H.11-120 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

VIII/H.11-130 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

VIII/H.11-140 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

VIII/H.11-150 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

VIII/H.11-160 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

Other Phlogopite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Phlogopite

KMg3(Si3Al)O10(F,OH)2
Dana No: 71.2.2b.1 Strunz No: VIII/H.11-80
Locality:

Notes: