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Buergerite Mineral Data

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General Buergerite Information

Help on Chemical  Formula: Chemical Formula: NaFe+++3Al6(BO3)3Si6O21F
Help on Composition: Composition: Molecular Weight = 1,052.34 gm
   Sodium     2.18 %  Na    2.94 % Na2O
   Aluminum  15.38 %  Al   29.07 % Al2O3
   Iron      15.92 %  Fe   22.76 % Fe2O3
   Silicon   16.01 %  Si   34.26 % SiO2
   Boron      3.08 %  B     9.92 % B2O3
   Oxygen    45.61 %  O
   Fluorine   1.81 %  F     1.81 % F
               -   %   F    -0.76 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaFe3+3Al6(BO3)3Si6O21F
Help on Environment: Environment: Of probable pneumatolytic origin, in cavities in a rhyolite.
Help on IMA Status: IMA Status: Approved IMA 1966 (Dana # Changed)
Help on Locality: Locality: From near Mexquitic, San Luis Potosi, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: To honor Professor Martin Buerger (1903-1986), eminent crystallographer, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
Help on Name Pronunciation: Name Pronunciation: Buergerite + Pronunciation Say BUERGERITE
Help on Synonym: Synonym: Buergerite - (
  ICSD 74183
  PDF 17-517

Buergerite Image

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Comments: Doubly-terminated brownish buergerite tourmaline crystals on matrix.
Location: Mexquitic, San Luis Potosí, Mexico. Scale: 26x15x13 mm.
© John Betts - Fine Minerals

Buergerite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.45331
Help on Cell Dimensions: Cell Dimensions: a = 15.874, c = 7.196, Z = 3; V = 1,570.34 Den(Calc)= 3.34
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.58(1), 2.96(0.85), 3.99(0.85),

Physical Properties of Buergerite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Bronze, Dark brown, Black.
Help on Density: Density: 3.31
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Hardness: Hardness: 7 - Quartz
Help on Streak: Streak: yellowish brown

Optical Properties of Buergerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.091 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.099 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2081,KPDmeas= 0.21,KC= 0.2309
Ncalc = 1.76 - 1.77
Help on Optical Data: Optical Data: Uniaxial (-), e=1.655, w=1.735, bire=0.0800.

Calculated Properties of Buergerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Buergerite =3.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBuergerite = 5.89 barns/electron
U=PEBuergerite x rElectron Density= 19.07 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Buergerite is Not Radioactive

Buergerite Classification

Help on  Dana Class: Dana Class: 61.03c.01.05 (61)Cyclosilicate Six-Membered Rings
  (61.03c)with borate groups (Ferric Tourmaline Subgroup)
  (61.03c.01)Buergerite Subgroup
61.03c.01.05 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m
61.03c.01.06 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m
Help on  Strunz Class: Strunz Class: 09.CK.05 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CK -[Si6O18]12- 6-membered single rings, with insular complex anions
09.CK.05 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m
09.CK.05 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m
09.CK.05 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m
09.CK.05 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
09.CK.05 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m
09.CK.05 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m
09.CK.05 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m
09.CK.05 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
09.CK.05 Hydroxyuvite! CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) R 3m 3m
09.CK.05 Schorl-(F)! NaFe3Al6Si6O18)(BO3)3(OH)3(F,OH) R 3m 3m

Other Buergerite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Buergerite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - MinDAT
13 - Mineral and Gemstone Kingdom
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info

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Dana No: 61.03c.01.05 Strunz No: 09.CK.05





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