Bismutoferrite Mineral Data

General Bismutoferrite Information

Chemical Formula: BiFe+++2(SiO4)2(OH) Composition: Molecular Weight = 521.85 gm    Iron      21.40 %  Fe   30.60 % Fe₂O₃    Silicon   10.76 %  Si   23.03 % SiO₂    Bismuth   40.05 %  Bi   44.65 % Bi₂O₃    Hydrogen   0.19 %  H     1.73 % H₂O    Oxygen    27.59 %  O             ______        ______              100.00 %      100.00 % = TOTAL OXIDE Empirical Formula: BiFe³⁺₂(SiO₄)₂(OH) Environment: Isostructural with Sb analog, chapmanite. IMA Status: Valid Species (Pre-IMA) 1871 Locality: Schneeserg, Saxony, Germay. Link to MinDat.org Location Data. Name Origin: Named in allusion to the composition. Name Pronunciation: Bismutoferrite + Pronunciation Synonym: ICSD 200069   PDF 11-174  

Bismutoferrite Image

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Bismutoferrite Crystallography

Axial Ratios: a:b:c =0.5776:1:0.858 Cell Dimensions: a = 5.21, b = 9.02, c = 7.74, Z = 2; beta = 100.67° V = 357.45 Den(Calc)= 4.85 Crystal System: Monoclinic - DomaticH-M Symbol (m) Space Group: Cm X Ray Diffraction: By Intensity(I/I_o): 3.87(1), 7.63(1), 2.9(0.7), Crystal Structure:

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Zhukhlistov A P , Zvyagin B B , Soviet Physics Crystallography , 22 (1977) p.419-423, Determination of the crystal structures of chapmanite and bismuthoferrite by, high-voltage electron diffraction, Locality: Schneeberg, Saxony, Germany

 

Physical Properties of Bismutoferrite

Color: Green, Light yellow. Density: 4.47 Diaphaneity: Translucent to opaque Habit: Massive - Uniformly indistinguishable crystals forming large masses. Hardness: 6 - Orthoclase Luster: Adamantine - Resinous  

Optical Properties of Bismutoferrite

Gladstone-Dale: CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.085 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2,KPDmeas= 0.217,KC= 0.2185
Ncalc = 1.98 - 2.06 Optical Data: Biaxial (?), a=1.93, b=1.97, g=2.01, bire=0.0800  

Calculated Properties of Bismutoferrite

Electron Density: Bulk Density (Electron Density)=4.04 gm/cc
note: Specific Gravity of Bismutoferrite =4.47 gm/cc.
Fermion Index: Fermion Index = 0.0096974151
Boson Index = 0.9903025849 Photoelectric: PE_{Bismutoferrite} = 719.87 barns/electron
U=PE_{Bismutoferrite} x rElectron Density=2,910.46 barns/cc.
Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bismutoferrite is Not Radioactive  

Bismutoferrite Classification

Dana Class: 71.01.03.01 (71)Phyllosilicate Sheets of Six-Membered Rings   (71.01)with 1:1 layers   (71.01.03)Bismutoferrite group  

71.01.03.01 Bismutoferrite BiFe2(SiO4)2(OH) Cm m

 

71.01.03.02 Chapmanite SbFe2(SiO4)2(OH) Cm m

Strunz Class: 09.ED.25 09 - SILICATES (Germanates)   09.E - Phyllosilicates   09.ED -Phyllosilicates with kaolinite layers  

09.ED.25 Bismutoferrite BiFe2(SiO4)2(OH) Cm m

 

09.ED.25 Chapmanite SbFe2(SiO4)2(OH) Cm m

 

Other Bismutoferrite Information

References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) See Also: Links to other databases for Bismutoferrite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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