Mineralogy Database

Feitknechtite Mineral Data

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General Feitknechtite Information

Help on Chemical  Formula: Chemical Formula: beta-Mn+++O(OH)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn3+O(OH)
Help on Environment: Environment: Alteration product of Mn ores.
Help on IMA Status: IMA Status: Approved IMA 1965
Help on Locality: Locality: Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Walter Feitknecht (1899-1975), Swiss, professor of chemistry, University of Bern.
Help on Name Pronunciation: Name Pronunciation: Feitknechtite + Pronunciation Say FEITKNECHTITE

Feitknechtite Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:1.08139
Help on Cell Dimensions: Cell Dimensions: a = 8.6, c = 9.3, Z = 16; V = 595.68 Den(Calc)= 3.92
Help on Crystal System: Crystal System: Hexagonal Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.62(1), 2.64(0.5), 2.36(0.2),

Physical Properties of Feitknechtite

Help on Color: Color: Brownish black, Black.
Help on Density: Density: 3.8
Help on Diaphaneity: Diaphaneity: Translucent to Subopaque
Help on Habit: Habit: Hexagonal - Six-sided crystal shape in cross-section or habit.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Thin - Flat dimensioned crystals.
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: brown

Optical Properties of Feitknechtite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (-), e=1.95, w=2.055, bire=0.1050.

Calculated Properties of Feitknechtite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.63 gm/cc
note: Specific Gravity of Feitknechtite =3.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001763676
Boson Index = 0.9998236324
Help on Photoelectric: Photoelectric: PEFeitknechtite = 16.21 barns/electron
U=PEFeitknechtite x rElectron Density= 58.84 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Feitknechtite is Not Radioactive

Feitknechtite Classification

Help on  Dana Class: Dana Class: (06)Hydroxides and Oxides Containing Hydroxyl
  (06.01)where X+++O OH
  (06.01.04)Heterogenite Group Heterogenite-2H CoO(OH) P 63/mmc 6/m 2/m 2/m Heterogenite-3R CoO(OH) R 3m 3 2/m Feitknechtite beta-MnO(OH) Unk Hex Feroxyhyte FeO(OH) Unk Hex
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 04.FE.25





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