Buergerite Mineral Data (original) (raw)
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
______ ______
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 Potosí, Mexico.Scale: 26x15x13 mm. © John Betts - Fine Minerals |
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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
X Ray Diffraction:
By Intensity(I/Io): 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:
PEBuergerite = 5.89 barns/electron
U=PEBuergerite 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: