Buergerite Mineral Data

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.

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 Potos?, 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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Buergerite

Electron Density:

r_electron=3.24 gm/cc
note: r_Buergerite=3.31 gm/cc.

Fermion Index

Fermion Index = 0.0172
Boson Index = 0.9828

Photoelectric:

PE_Buergerite= 5.89 barns/electron
U=PE_Buergerite x r_electron= 19.07 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Buergerite is Not Radioactive

Buergerite Classification

Dana Class:

61.3c.1.5 (61)Cyclosilicate Six-Membered Rings

(61.3c)with borate groups (Ferric Tourmaline Subgroup)

(61.3c.1)Dana Group

61.3c.1.5 Buergerite ! NaFe3Al6(BO3)3Si6O21F R 3m 3m

61.3c.1.6 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m

Strunz Class:

VIII/E.19-70 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.19 - Tourmaline group

VIII/E.19-05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-10 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-15 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-20 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-30 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-35 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-50 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-55 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m

VIII/E.19-60 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m

VIII/E.19-70 Buergerite NaFe3Al6(BO3)3Si6O21F R 3m 3m

VIII/E.19-75 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-80 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m

VIII/E.19-90 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m

VIII/E.19-100 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 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)

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Buergerite

NaFe+++3Al6(BO3)3Si6O21F
Dana No: 61.3c.1.5 Strunz No: VIII/E.19-70
Locality:

Notes: