Freudenbergite Mineral Data

General Freudenbergite Information

Chemical Formula:

Na2Fe+++2Ti6O16

Composition:

Molecular Weight = 700.94 gm

Sodium 6.56 % Na 8.84 % Na₂O

Titanium 40.98 % Ti 68.38 % TiO₂

Iron 15.93 % Fe 22.78 % Fe₂O₃

Oxygen 36.52 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Fe³⁺₂Ti₆O₁₆

IMA Status:

Approved IMA 1961

Locality:

Mickelsberg, Katzenbuckel, Odenwald, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Wilhelm Freudenberg (1881-), German geologist, who studied the rocks of Odenwald, Germany, where the mineral was found.

Name Pronunciation:

Freudenbergite + Pronunciation

Synonym:

ICSD 1392

PDF 17-613

Freudenbergite Image

Images:

Freudenbergite

Comments: BSE image of a sector-zoned crystal of freudenbergite. The bright pyramids correspond to sector (001), and the darker ones belong to sector (100).
Location: Peralkaline alkali syenite dikes at Katzenbuckel, southwestern Germany. Scale: See Image.
© Canadian Mineralogist

Freudenbergite Crystallography

Axial Ratios:

a:b:c =3.2087:1:1.6957

Cell Dimensions:

a = 12.267, b = 3.823, c = 6.483, Z = 1; beta = 107.1° V = 290.59 Den(Calc)= 4.01

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.627(1), 1.911(0.9), 3.1(0.8),

Physical Properties of Freudenbergite

Cleavage:

{001} Good, {010} Good

Color:

Brownish black, Gray, Black.

Density:

4.3

Diaphaneity:

Transparent to Translucent

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Luster:

Vitreous (Glassy)

Streak:

light yellow brown

Optical Properties of Freudenbergite

Gladstone-Dale:

CI meas= 0.092 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3479,KPDmeas= 0.3244,KC= 0.3573
Ncalc = 2.43 - 2.54

Optical Data:

Biaxial (+), b=2.37-2.42

Calculated Properties of Freudenbergite

Electron Density:

Bulk Density (Electron Density)=3.82 gm/cc
note: Specific Gravity of Freudenbergite =4.01 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_{Freudenbergite}= 11.82 barns/electron
U=PE_{Freudenbergite} x rElectron Density= 45.16 barns/cc.

Radioactivity:

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

Freudenbergite Classification

Dana Class:

07.09.03.01 (07)Multiple Oxides

(07.09)Dana Type

(07.09.03)Dana Group

07.09.03.01 Freudenbergite Na2Fe2Ti6O16 C 2/m 2/m

Strunz Class:

04.CC.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.C - Metal:Oxygen = 2:3, 3:5, and Similar

04.CC -With large and medium-sized cations

04.CC.10 Freudenbergite Na2Fe2Ti6O16 C 2/m 2/m

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

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

Freudenbergite

Na2Fe+++2Ti6O16
Dana No: 07.09.03.01 Strunz No: 04.CC.10
Locality:

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