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Bobfergusonite Mineral Data

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General Bobfergusonite Information

Help on Chemical  Formula: Chemical Formula: Na2Mn++5Fe+++Al(PO4)6
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na2Mn2+5Fe3+Al(PO4)6
Help on Environment: Environment: An uncommon primary mineral in the intermediate zone of a granite pegmatite enriched in manganese and fluorine.
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: Locality: From the Gotcha claim, on an island in Cross Lake, Manitoba, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: To honor Emeritus Professor Robert Bury Ferguson (1920- ), Canadian mineralogist, University of Manitoba, Winnipeg, Canada, especially for his contributions to pegmatite mineralogy.
Help on Name Pronunciation: Name Pronunciation: Bobfergusonite + Pronunciation Say BOBFERGUSONITE
Help on Synonym: Synonym: ICSD 63261
  IMA1984-072
  PDF 40-509
 

Bobfergusonite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =1.0229:1:0.884
Help on Cell Dimensions: Cell Dimensions: a = 12.773, b = 12.486, c = 11.038, Z = 4; beta = 97.15° V = 1,746.69 Den(Calc)= 3.70
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.05(1), 2.08(0.67), 2.87(0.66),
 

Physical Properties of Bobfergusonite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Greenish brown, Reddish brown.
Help on Density: Density: 3.54
Help on Diaphaneity: Diaphaneity: Transparent to Subopaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Resinous
Help on Streak: Streak: yellowish brown
 

Optical Properties of Bobfergusonite

Help on Gladstone-Dale: 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
Ncalc = 1.71 - 1.74
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.40 gm/cc
note: Specific Gravity of Bobfergusonite =3.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014057662
Boson Index = 0.9985942338
Help on Photoelectric: Photoelectric: PEBobfergusonite = 10.07 barns/electron
U=PEBobfergusonite x rElectron Density= 34.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bobfergusonite is Not Radioactive
 

Bobfergusonite Classification

Help on  Dana Class: Dana Class: 38.02.04.05 (38)Anhydrous Phosphates, etc
  (38.02)(A+ B++)5 (XO4)3
  (38.02.04)Alluaudite-Wyllieite Group (Wyllieite Subgroup)
 
38.02.04.01 Ferrowyllieite (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 P 21/n 2/m
 
38.02.04.02 Wyllieite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 21/n 2/m
 
38.02.04.03 Rosemaryite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 21/n 2/m
 
38.02.04.04 Qingheiite Na2(Mn,Mg,Fe)(Al,Fe)(PO4)3 P 21/n 2/m
 
38.02.04.05 Bobfergusonite Na2Mn5FeAl(PO4)6 P 21/n 2/m
 
38.02.04.06 Bradaczekite! NaCu4(AsO4)3 C 2/c 2/m
 
38.02.04.07 Ferrorosemaryite! []NaFeFeAl(PO4)3 P 21/n 2/m
Help on  Strunz Class: Strunz Class: 08.AC.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AC -With medium-sized and large cations
 
08.AC.15 Bobfergusonite Na2Mn5FeAl(PO4)6 P 21/n 2/m
 
08.AC.15 Ferrowyllieite (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 P 21/n 2/m
 
08.AC.15 Qingheiite Na2(Mn,Mg,Fe)(Al,Fe)(PO4)3 P 21/n 2/m
 
08.AC.15 Rosemaryite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 21/n 2/m
 
08.AC.15 Wyllieite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 21/n 2/m
 
08.AC.15 Ferrorosemaryite! []NaFeFeAl(PO4)3 P 21/n 2/m
 

Other Bobfergusonite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Bobfergusonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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

Bobfergusonite

Na2Mn++5Fe+++Al(PO4)6
Dana No: 38.02.04.05 Strunz No: 08.AC.15
Locality:

 

Notes:

 

 
   
 


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