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

Images:

Bismutoferrite

Comments: Yellow-greenish, earthy bismutoferrite.
Location: Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Specimen size 8.5 cm.
© Thomas Witzke / Abraxas-Verlag

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 - Domatic H-M Symbol (m) Space Group: Cm

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

By Intensity(I/I_o): 3.87(1), 7.63(1), 2.9(0.7),

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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Bismutoferrite

BiFe+++2(SiO4)2(OH)
Dana No: 71.01.03.01 Strunz No: 09.ED.25
Locality:

Notes:

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