Buergerite Mineral Data

General Buergerite Information

Chemical Formula:

NaFe+++3Al6(BO3)3Si6O21F

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

Empirical Formula:

NaFe³⁺₃Al₆(BO₃)₃Si₆O₂₁F

Environment:

Of probable pneumatolytic origin, in cavities in a rhyolite.

IMA Status:

Approved IMA 1966 (Dana # Changed)

Locality:

From near Mexquitic, San Luis Potosi, Mexico. Link to MinDat.org Location Data.

Name Origin:

To honor Professor Martin Buerger (1903-1986), eminent crystallographer, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.

Name Pronunciation:

Buergerite + Pronunciation

Synonym:

Buergerite - (61.3.1.5)

ICSD 74183

PDF 17-517

Tourmaline

Buergerite Image

Images:

Buergerite

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

Buergerite Crystallography

Axial Ratios:

a:c = 1:0.45331

Cell Dimensions:

a = 15.874, c = 7.196, Z = 3; V = 1,570.34 Den(Calc)= 3.34

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 2.58(1), 2.96(0.85), 3.99(0.85),

Crystal Structure:

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Tippe A , Hamilton W C , American Mineralogist , 56 (1971) p.101-113, A neutron-diffraction study of the ferric tourmaline, buergerite

Physical Properties of Buergerite

Cleavage:

{???} Good

Color:

Bronze, Dark brown, Black.

Density:

3.31

Diaphaneity:

Translucent to Opaque

Hardness:

7 - Quartz

Streak:

yellowish brown

Optical Properties of Buergerite

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

Optical Data:

Uniaxial (-), e=1.655, w=1.735, bire=0.0800.

Calculated Properties of Buergerite

Electron Density:

Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Buergerite =3.31 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Buergerite= 5.89 barns/electron
U=PE_Buergerite x rElectron Density= 19.07 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Buergerite is Not Radioactive

Buergerite Classification

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

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Buergerite Specimen Label here :

Buergerite

NaFe+++3Al6(BO3)3Si6O21F
Dana No: 61.03c.01.05 Strunz No: 09.CK.05
Locality:

Notes: