Bobfergusonite Mineral Data

Bobfergusonite Mineral Data +

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General Bobfergusonite Information

Chemical Formula:

Na2Mn++5Fe+++Al(PO4)6

Composition:

Molecular Weight = 973.33 gm

Sodium 4.72 % Na 6.37 % Na₂O

Manganese 28.22 % Mn 36.44 % MnO

Aluminum 2.77 % Al 5.24 % Al₂O₃

Iron 5.74 % Fe 8.20 % Fe₂O₃

Phosphorus 19.09 % P 43.75 % P₂O₅

Oxygen 39.45 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Mn²⁺₅Fe³⁺Al(PO₄)₆

Environment:

An uncommon primary mineral in the intermediate zone of a granite pegmatite enriched in manganese and fluorine.

IMA Status:

Approved IMA 1986

Locality:

From the Gotcha claim, on an island in Cross Lake, Manitoba, Canada. Link to MinDat.org Location Data.

Name Origin:

To honor Emeritus Professor Robert Bury Ferguson (1920- ), Canadian mineralogist, University of Manitoba, Winnipeg, Canada, especially for his contributions to pegmatite mineralogy.

Synonym:

ICSD 63261

IMA1984-072

PDF 40-509

Bobfergusonite Image

Images:

Bobfergusonite

Comments: Opaque dark green to brown crystalline bobfergusonite in pegmatite.
Location: Cross Lake, Manitoba, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bobfergusonite Crystallography

Axial Ratios:

a:b:c =1.0229:1:0.884

Cell Dimensions:

a = 12.773, b = 12.486, c = 11.038, Z = 4; beta = 97.15° V = 1,746.69 Den(Calc)= 3.70

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 3.05(1), 2.08(0.67), 2.87(0.66),

Crystal Structure:

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Ercit T S , Hawthorne F C , Cerny P , The Canadian Mineralogist , 24 (1986) p.605-614, The crystal structure of bobfergusonite.

View Additional jPOWD Structure files for Bobfergusonite
[1]

Physical Properties of Bobfergusonite

Cleavage:

[010] Perfect

Color:

Greenish brown, Reddish brown.

Density:

3.54

Diaphaniety:

Transparent to Subopaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

4 - Fluorite

Luster:

Resinous

Streak:

yellowish brown

Optical Properties of Bobfergusonite

Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1898,KPDmeas= 0.1984,KC= 0.2006

Optical Data:

Biaxial (+), a=1.694, b=1.698, g=1.715, bire=0.0210, 2V(Calc)=54, 2V(Meas)=46.4.

Calculated Properties of Bobfergusonite

Electron Density:

r_electron=3.40 gm/cc
note: r_{Bobfergusonite}=3.54 gm/cc.

Fermion Index

Fermion Index = 0.0014
Boson Index = 0.9986

Photoelectric:

PE_{Bobfergusonite}= 10.07 barns/electron
U=PE_{Bobfergusonite} x r_electron= 34.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bobfergusonite is Not Radioactive

Bobfergusonite Classification

Dana Class:

38.2.4.5 (38)Anhydrous Phosphates, etc

(38.2)(A+ B++)5 (XO4)3

(38.2.4)Alluaudite-Wyllieite Group (Wyllieite Subgroup)

38.2.4.1 Ferrowyllieite (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.2.4.2 Wyllieite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.2.4.3 Rosemaryite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.2.4.4 Qingheiite Na2(Mn,Mg,Fe)(Al,Fe)(PO4)3 P 2₁/n 2/m

38.2.4.5 Bobfergusonite Na2Mn5FeAl(PO4)6 P 2₁/n 2/m

38.2.4.6 Bradaczekite! NaCu4(AsO4)3 C 2/c 2/m

38.2.4.7 Ferrorosemaryite! []NaFeFeAl(PO4)3 P 2₁/n 2/m

Strunz Class:

VII/A.06-20 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na

VII/A.06 - Alluaudite- Hagendorfite group

VII/A.06-10 Qingheiite Na2(Mn,Mg,Fe)(Al,Fe)(PO4)3 P 2₁/n 2/m

VII/A.06-20 Bobfergusonite Na2Mn5FeAl(PO4)6 P 2₁/n 2/m

VII/A.06-30 Ferrowyllieite (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

VII/A.06-40 Wyllieite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

VII/A.06-50 Rosemaryite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

VII/A.06-60 Ferroalluaudite NaCaFe(Fe,Mn,Fe,Mg)2(PO4)3 C 2/a 2/m

VII/A.06-70 Alluaudite NaCaFe(Mn,Fe,Fe,Mg)2(PO4)3 C 2/c 2/m

VII/A.06-80 Maghagendorfite NaMgMn(Fe,Fe)2(PO4)3 I 2₁/a 2/m

VII/A.06-85 Ferrohagendorfite* (Na,Ca)2Fe(Fe,Fe)2(PO4)3 I 2₁/a 2/m

VII/A.06-90 Hagendorfite NaCaMn(Fe,Fe,Mg)2(PO4)3 I 2₁/a 2/m

VII/A.06-100 Varulite NaCaMn(Mn,Fe,Fe)2(PO4)3 C 2/c 2/m

VII/A.06-110 Arseniopleite (Ca,Na)(Na,Pb)Mn(Mn,Mg,Fe)2(AsO4)3 I2/a 2/m

VII/A.06-120 Caryinite (Na,Pb)(Ca,Na)(Ca,Mn)(Mn,Mg)2(AsO4)3 I2/c 2/m

Other Bobfergusonite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Bobfergusonite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

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

Bobfergusonite

Na2Mn++5Fe+++Al(PO4)6
Dana No: 38.2.4.5 Strunz No: VII/A.06-20
Locality:

Notes: