Feitknechtite Mineral Data

General Feitknechtite Information

Chemical Formula:

beta-Mn+++O(OH)

Composition:

Molecular Weight = 87.94 gm

Manganese 62.47 % Mn 89.76 % Mn₂O₃

Hydrogen 1.15 % H 10.24 % H₂O

Oxygen 36.39 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn³⁺O(OH)

Environment:

Alteration product of Mn ores.

IMA Status:

Approved IMA 1965

Locality:

Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Walter Feitknecht (1899-1975), Swiss, professor of chemistry, University of Bern.

Name Pronunciation:

Feitknechtite + Pronunciation

Feitknechtite Image

Images:

Feitknechtite

Comments: Brown feitknechtite with pink rhodonite.
Location: Ioi Mine, Ritto Cho, Shiga, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Feitknechtite Crystallography

Axial Ratios:

a:c = 1:1.08139

Cell Dimensions:

a = 8.6, c = 9.3, Z = 16; V = 595.68 Den(Calc)= 3.92

Crystal System:

Hexagonal Space Group: Unk

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

By Intensity(I/I_o): 4.62(1), 2.64(0.5), 2.36(0.2),

Physical Properties of Feitknechtite

Color:

Brownish black, Black.

Density:

3.8

Diaphaneity:

Translucent to Subopaque

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Thin - Flat dimensioned crystals.

Luster:

Earthy (Dull)

Streak:

brown

Optical Properties of Feitknechtite

Gladstone-Dale:

CI meas= 0.135 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.161 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2557,KPDmeas= 0.2638,KC= 0.305
Ncalc = 2.16 - 2.2

Optical Data:

Uniaxial (-), e=1.95, w=2.055, bire=0.1050.

Calculated Properties of Feitknechtite

Electron Density:

Bulk Density (Electron Density)=3.63 gm/cc
note: Specific Gravity of Feitknechtite =3.80 gm/cc.

Fermion Index:

Fermion Index = 0.0001763676
Boson Index = 0.9998236324

Photoelectric:

PE_{Feitknechtite}= 16.21 barns/electron
U=PE_{Feitknechtite} x rElectron Density= 58.84 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Feitknechtite is Not Radioactive

Feitknechtite Classification

Dana Class:

06.01.04.03 (06)Hydroxides and Oxides Containing Hydroxyl

(06.01)where X+++O OH

(06.01.04)Heterogenite Group

06.01.04.01 Heterogenite-2H CoO(OH) P 6₃/mmc 6/m 2/m 2/m

06.01.04.02 Heterogenite-3R CoO(OH) R 3m 3 2/m

06.01.04.03 Feitknechtite beta-MnO(OH) Unk Hex

06.01.04.04 Feroxyhyte FeO(OH) Unk Hex

Strunz Class:

04.FE.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FE -Hydroxides with OH, without H2O; sheets of edge-sharing octahedra

04.FE.25 Feitknechtite beta-MnO(OH) Unk Hex

04.FE.25 Lithiophorite (Al,Li)MnO2(OH)2 R 3m 3 2/m

Other Feitknechtite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Feitknechtite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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

Feitknechtite

beta-Mn+++O(OH)
Dana No: 06.01.04.03 Strunz No: 04.FE.25
Locality:

Notes:

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