Feitknechtite Mineral Data

Feitknechtite Mineral Data +

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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.

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:

HexagonalSpace 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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Feitknechtite

Electron Density:

r_electron=3.63 gm/cc
note: r_{Feitknechtite}=3.80 gm/cc.

Fermion Index

Fermion Index = 0.00017
Boson Index = 0.99983

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Feitknechtite is Not Radioactive

Feitknechtite Classification

Dana Class:

6.1.4.3 (6)Hydroxides and Oxides Containing Hydroxyl

(6.1)where X+++O OH

(6.1.4)Dana Group

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

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

6.1.4.3 Feitknechtite beta-MnO(OH) Unk Hex

6.1.4.4 Feroxyhyte FeO(OH) Unk Hex

Strunz Class:

IV/F.06-90 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 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 - Franklin Minerals(Dunn) 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Feitknechtite

beta-Mn+++O(OH)
Dana No: 6.1.4.3 Strunz No: IV/F.06-90
Locality:

Notes: