General Phlogopite Information
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Chemical Formula: |
KMg3(Si3Al)O10(F,OH)2 |
Composition: |
Molecular Weight = 419.25 gm |
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Potassium 9.33 % K 11.23 % K2O |
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Magnesium 17.39 % Mg 28.84 % MgO |
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Aluminum 6.44 % Al 12.16 % Al2O3 |
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Silicon 20.10 % Si 42.99 % SiO2 |
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Hydrogen 0.24 % H 2.15 % H2O |
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Oxygen 41.98 % O |
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Fluorine 4.53 % F 4.53 % F |
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- % F -1.91 % -O=F2 |
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______ ______ |
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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 |
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Phlogopite Image |
Images:
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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 |
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Images:
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Images:
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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 |
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Phlogopite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 9.998(1), 2.613(0.53), 3.382(0.33), |
Forms:
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Forms:
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Crystal Structure:
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Physical Properties of Phlogopite
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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 |
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Optical Properties of Phlogopite
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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. |
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Calculated Properties of Phlogopite
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Electron Density: |
relectron=2.81 gm/cc note: rPhlogopite =2.83 gm/cc. |
Fermion Index |
Fermion Index = 0.02699 Boson Index = 0.97301 |
Photoelectric: |
PEPhlogopite = 2.30 barns/electron U=PEPhlogopite x relectron= 6.46 barns/cc. |
Radioactivity: |
GRapi = 133.53 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Phlogopite - barely detectable
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Phlogopite Classification
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Dana Class: |
71.2.2b.1 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.2)with 2:1 Layers |
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(71.2.2b)Mica Group (Biotite subgroup) |
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71.2.2b.1 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m |
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71.2.2b.1a Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m |
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71.2.2b.1b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m |
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71.2.2b.2 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m |
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71.2.2b.3 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m |
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71.2.2b.3a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m |
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71.2.2b.4 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m |
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71.2.2b.5 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m |
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71.2.2b.5a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m |
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71.2.2b.6 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m |
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71.2.2b.7 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono |
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71.2.2b.8 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m |
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71.2.2b.8a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m |
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71.2.2b.8b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono |
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71.2.2b.9 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m |
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71.2.2b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m |
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71.2.2b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m |
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71.2.2b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m |
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71.2.2b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m |
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71.2.2b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m |
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71.2.2b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m |
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71.2.2b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m |
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71.2.2b.17 IMA2004-049! NaMg3(AlSi3)O10(OH)2 C 2/m 2/m |
Strunz Class: |
VIII/H.11-80 VIII - Silicates |
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VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups |
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VIII/H.11 - Mica group, Biotite series |
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VIII/H.11-00* Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m |
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VIII/H.11-10 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m |
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VIII/H.11-20 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m |
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VIII/H.11-30 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m |
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VIII/H.11-35 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m |
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VIII/H.11-40 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m |
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VIII/H.11-50 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m |
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VIII/H.11-60 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m |
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VIII/H.11-70 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m |
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VIII/H.11-80 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m |
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VIII/H.11-90 Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m |
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VIII/H.11-100 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m |
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VIII/H.11-102 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m |
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VIII/H.11-105 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m |
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VIII/H.11-110 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m |
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VIII/H.11-120 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m |
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VIII/H.11-130 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m |
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VIII/H.11-140 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m |
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VIII/H.11-150 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m |
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VIII/H.11-160 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m |
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Other Phlogopite Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) |
See Also: |
Links to other databases for Phlogopite :
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 -Google Images
12 -Google Scholar
13 -Handbook of Mineralogy (MinSocAm)
14 -Handbook of Mineralogy (UofA)
15 -MinDAT
16 -MinMax(Deutsch)
17 -MinMax(English)
18 -Mineralienatlas (Deutsch)
19 - Minerals of Wisconsin
20 -QUT Mineral Atlas
21 - Scandinavian mineral gallery
22 - UCLA - Petrography Thin-Sections
23 - WWW-MINCRYST
24 -École des Mines de Paris
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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:
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