Buergerite Mineral Data

[On-Line Catalogue] [On-Line Auctions] [eBay] [Contact Us] [Policies]
We specialize in fine European and Asian Mineral Specimens
Heliodor is based in Prague, Czech Republic

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 Potosí, 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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
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

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 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - HyperPhysics
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

Search for Buergerite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Buergerite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Buergerite Mineral Data :

Ask about Buergerite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: