Mineralogy Database

Freudenbergite Mineral Data

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General Freudenbergite Information

Help on Chemical  Formula: Chemical Formula: Na2Fe+++2Ti6O16
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na2Fe3+2Ti6O16
Help on IMA Status: IMA Status: Approved IMA 1961
Help on Locality: Locality: Mickelsberg, Katzenbuckel, Odenwald, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Wilhelm Freudenberg (1881-), German geologist, who studied the rocks of Odenwald, Germany, where the mineral was found.
Help on Name Pronunciation: Name Pronunciation: Freudenbergite + Pronunciation Say FREUDENBERGITE
Help on Synonym: Synonym: ICSD 1392
  PDF 17-613

Freudenbergite Image

Click Here for Larger   Image in a New Browser Window Images:
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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

Help on Axial Ratios: Axial Ratios: a:b:c =3.2087:1:1.6957
Help on Cell Dimensions: Cell Dimensions: a = 12.267, b = 3.823, c = 6.483, Z = 1; beta = 107.1° V = 290.59 Den(Calc)= 4.01
Help on Crystal System: 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/Io): 3.627(1), 1.911(0.9), 3.1(0.8),

Physical Properties of Freudenbergite

Help on Cleavage: Cleavage: {001} Good, {010} Good
Help on Color: Color: Brownish black, Gray, Black.
Help on Density: Density: 4.3
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light yellow brown

Optical Properties of Freudenbergite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), b=2.37-2.42

Calculated Properties of Freudenbergite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.82 gm/cc
note: Specific Gravity of Freudenbergite =4.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEFreudenbergite = 11.82 barns/electron
U=PEFreudenbergite x rElectron Density= 45.16 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Freudenbergite is Not Radioactive

Freudenbergite Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.09)Dana Type
  (07.09.03)Dana Group Freudenbergite Na2Fe2Ti6O16 C 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 04.CC.10





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