Bismutoferrite Mineral Data

Bismutoferrite Mineral Data +

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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.

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 - DomaticH-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

Diaphaniety:

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

Optical Data:

Biaxial (?), a=1.93, b=1.97, g=2.01, bire=0.0800

Calculated Properties of Bismutoferrite

Electron Density:

r_electron=4.04 gm/cc
note: r_{Bismutoferrite}=4.47 gm/cc.

Fermion Index

Fermion Index = 0.00969
Boson Index = 0.99031

Photoelectric:

PE_{Bismutoferrite}= 719.87 barns/electron
U=PE_{Bismutoferrite} x r_electron=2,910.46 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bismutoferrite is Not Radioactive

Bismutoferrite Classification

Dana Class:

71.1.3.1 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.1)with 1:1 layers

(71.1.3)Bismutoferrite group

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

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

Strunz Class:

VIII/B.06-20 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.06 - Chapmanite - Bismutoferrite series

VIII/B.06-10 Chapmanite SbFe2(SiO4)2(OH) Cm m

VIII/B.06-20 Bismutoferrite BiFe2(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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Bismutoferrite

BiFe+++2(SiO4)2(OH)
Dana No: 71.1.3.1 Strunz No: VIII/B.06-20
Locality:

Notes: