General Buergerite Information
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Chemical Formula: |
NaFe+++3Al6(BO3)3Si6O21F |
Composition: |
Molecular Weight = 1,052.34 gm |
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Sodium 2.18 % Na 2.94 % Na2O |
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Aluminum 15.38 % Al 29.07 % Al2O3 |
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Iron 15.92 % Fe 22.76 % Fe2O3 |
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Silicon 16.01 % Si 34.26 % SiO2 |
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Boron 3.08 % B 9.92 % B2O3 |
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Oxygen 45.61 % O |
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Fluorine 1.81 % F 1.81 % F |
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- % F -0.76 % -O=F2 |
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______ ______ |
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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) |
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ICSD 74183 |
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PDF 17-517 |
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Tourmaline |
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Buergerite Image |
Images:
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Buergerite
Comments: Doubly-terminated brownish buergerite tourmaline crystals on matrix.
Location: Mexquitic, San Luis Potos?, Mexico.
Scale: 26x15x13 mm.
© John Betts - Fine Minerals |
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Buergerite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 2.58(1), 2.96(0.85), 3.99(0.85), |
Crystal Structure:
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above
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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
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Physical Properties of Buergerite
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Cleavage: |
[???] Good |
Color: |
Bronze, Dark brown, Black. |
Density: |
3.31 |
Diaphaniety: |
Translucent to Opaque |
Hardness: |
7 - Quartz |
Streak: |
yellowish brown |
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Optical Properties of Buergerite
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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. |
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Calculated Properties of Buergerite
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Electron Density: |
relectron=3.24 gm/cc note: rBuergerite =3.31 gm/cc. |
Fermion Index |
Fermion Index = 0.0172 Boson Index = 0.9828 |
Photoelectric: |
PEBuergerite = 5.89 barns/electron U=PEBuergerite x relectron= 19.07 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Buergerite is Not Radioactive |
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Buergerite Classification
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Dana Class: |
61.3c.1.5 (61)Cyclosilicate Six-Membered Rings |
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(61.3c)with borate groups (Ferric Tourmaline Subgroup) |
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(61.3c.1)Dana Group |
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61.3c.1.5 Buergerite ! NaFe3Al6(BO3)3Si6O21F R 3m 3m |
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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 |
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VIII/E - Cyklosilicates, six rings [Si6O18]12- |
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VIII/E.19 - Tourmaline group |
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VIII/E.19-05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m |
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VIII/E.19-10 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m |
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VIII/E.19-15 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m |
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VIII/E.19-20 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m |
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VIII/E.19-30 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m |
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VIII/E.19-35 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m |
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VIII/E.19-50 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m |
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VIII/E.19-55 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m |
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VIII/E.19-60 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m |
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VIII/E.19-70 Buergerite NaFe3Al6(BO3)3Si6O21F R 3m 3m |
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VIII/E.19-75 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m |
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VIII/E.19-80 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m |
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VIII/E.19-90 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m |
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VIII/E.19-100 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m |
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Other Buergerite Information
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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 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (MinSocAm)
8 -Handbook of Mineralogy (UofA)
9 - HyperPhysics
10 -MinDAT
11 -MinMax(Deutsch)
12 -MinMax(English)
13 -Mineralienatlas (Deutsch)
14 -QUT Mineral Atlas
15 - WWW-MINCRYST
16 -École des Mines de Paris
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Print or Cut-and-Paste your Buergerite Specimen Label here :
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Buergerite
NaFe+++3Al6(BO3)3Si6O21F
Dana No: 61.3c.1.5 Strunz No: VIII/E.19-70
Locality:
Notes:
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