Akaganeite Mineral Data

Akaganeite Mineral Data +

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General Akaganeite Information

Chemical Formula:

Fe+++(O,OH,Cl)

Composition:

Molecular Weight = 761.37 gm

Iron 55.75 % Fe 79.70 % Fe₂O₃

Nickel 3.08 % Ni 3.92 % NiO

Hydrogen 1.28 % H 11.48 % H₂O

Chlorine 6.05 % Cl 6.05 % Cl

- % Cl -1.37 % -O=Cl₂

Oxygen 33.83 % O

______ ______

100.00 % 99.79 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺_7.6Ni_0.4O_6.4(OH)_9.7Cl_1.3

Environment:

Apparently formed from pyrrhotite by ferric-sulfate-bearing solutions. Transforms to hematite at 290 to 310 Deg. C.

IMA Status:

Approved IMA 1961

Locality:

Akagane mine, Iwate Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 69606

PDF 42-1315

Akaganeite Image

Images:

Akaganeite

Comments: Rusty brown coating of akaganeite on rock.
Location: Wells, Elko County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Akaganeite Crystallography

Axial Ratios:

a:b:c =3.4927:1:3.469

Cell Dimensions:

a = 10.587, b = 3.0311, c = 10.515, Z = 1; beta = 90.03° V = 337.43 Den(Calc)= 3.75

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m

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

By Intensity(I/I_o): 1.635(1), 3.311(1), 7.4(1),

Crystal Structure:

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Post J E , Buchwald V F , American Mineralogist , 76 (1991) p.272-277, Crystal structure refinement of akaganeite

View Additional jPOWD Structure files for Akaganeite
[1]

Physical Properties of Akaganeite

Color:

Brown, Rusty brown.

Density:

Diaphaniety:

Opaque

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Powdery - Forms a loose, poorly-coherent pulverulent mass.

Luster:

Adamantine - Metallic

Streak:

brownish yellow

Optical Properties of Akaganeite

Optical Data:

Biaxial (?)

NCalc= 2.19 - from Gladstone-Dale relationship (KC = 0.3161) where Ncalc=Dcalc*KC+1
NCalc= 1.95 - from Gladstone-Dale relationship (KC = 0.3161) where Ncalc=Dmeas*KC+1

Calculated Properties of Akaganeite

Electron Density:

r_electron=3.64 gm/cc
note: r_Akaganeite=3.75 gm/cc.

Fermion Index

Fermion Index = 0.01233
Boson Index = 0.98767

Photoelectric:

PE_Akaganeite= 18.39 barns/electron
U=PE_Akaganeite x r_electron= 66.91 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Akaganeite is Not Radioactive

Akaganeite Classification

Dana Class:

6.1.6.1 (6)Hydroxides and Oxides Containing Hydroxyl

(6.1)where X+++O OH

(6.1.6)Dana Group

6.1.6.1 Akaganeite Fe(O,OH,Cl) I2/m 2/m

Strunz Class:

IV/F.06-50 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.06 - Diaspore - Goethite - Faitknechtite series

IV/F.06-10 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m

IV/F.06-20 Boehmite AlO(OH) Amam 2/m 2/m 2/m

IV/F.06-25 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m

IV/F.06-30 Goethite FeO(OH) Pbnm 2/m 2/m 2/m

IV/F.06-40 Lepidocrocite FeO(OH) Amam 2/m 2/m 2/m

IV/F.06-50 Akaganeite Fe(O,OH,Cl) I2/m 2/m

IV/F.06-60 Feroxyhyte FeO(OH) Unk Hex

IV/F.06-70 Manganite MnO(OH) B21/d 2/m

IV/F.06-80 Groutite MnO(OH) Pbnm 2/m 2/m 2/m

IV/F.06-90 Feitknechtite beta-MnO(OH) Unk Hex

Other Akaganeite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(AmMin, v 88, p 782)

See Also:

Links to other databases for Akaganeite :
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 Akaganeite Specimen Label here :

Akaganeite

Fe+++(O,OH,Cl)
Dana No: 6.1.6.1 Strunz No: IV/F.06-50
Locality:

Notes: