Freudenbergite Mineral Data

Freudenbergite Mineral Data +

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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.

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 - PrismaticH-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

Diaphaniety:

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

Optical Data:

Biaxial (+), b=2.37-2.42

Calculated Properties of Freudenbergite

Electron Density:

r_electron=3.82 gm/cc
note: r_{Freudenbergite}=4.01 gm/cc.

Fermion Index

Fermion Index = 0.05654
Boson Index = 0.94346

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Freudenbergite is Not Radioactive

Freudenbergite Classification

Dana Class:

7.9.3.1 (7)Multiple Oxides

(7.9)where A B (O)2

(7.9.3)Dana Group

7.9.3.1 Freudenbergite Na2Fe2Ti6O16 C 2/m 2/m

Strunz Class:

IV/C.07-20 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.07 - Högbomite - Mengxianminite series

IV/C.07-10* Magnesiohogbomite-2N2S (Al,Fe,Fe,Mg,Ti,Zn)11O15(OH) P 6₃mc 6mm

IV/C.07-10** Magnesiohogbomite-2N3S (Mg,Fe)1.4Ti0.3Al4O8 P 6₃mc 6mm

IV/C.07-10 Magnesiohogbomite-6N6S (Mg,Fe)1.4Ti0.3Al4O8 R 3m 3 2/m

IV/C.07-15 Zincohogbomite-2N2S! (Zn,Fe)(2-2x)(Ti)xAl4O8 P 6₃mc 6mm

IV/C.07-17 Ferrohogbomite-2N2S! (Fe,Zn,Mg,Al)6Al14(Ti,Fe)2O30(OH)2 P 6₃mc 6mm

IV/C.07-20 Freudenbergite Na2Fe2Ti6O16 C 2/m 2/m

IV/C.07-30 Kamiokite Fe2Mo3O8 P 6₃mc 6mm

IV/C.07-40 Nolanite (V,Fe,Fe,Ti)10O14(OH)2 P 6₃mc 6mm

IV/C.07-42 Rinmanite! (Zn,Mn)2Sb2Mg2Fe4O14(OH)2 P 6₃mc 6mm

IV/C.07-45 Magnesionigerite-2N1S (Mg,Zn,Fe,Al)4(Sn,Fe)2Al10O22(OH)2 P 3m 3 2/m

IV/C.07-45* Magnesionigerite-6N6S (Mg,Zn,Fe,Al)4(Sn,Fe)2Al10O22(OH)2 Unk Trig

IV/C.07-50 Ferronigerite-2N1S (Zn,Mg,Fe)(Sn,Zn)2(Al,Fe)12O22(OH)2 P 3m or P 3m1 3 2/m

IV/C.07-50* Ferronigerite-6N6S (Fe,Zn)4Sn2(Al,Fe)15O30(OH)2 R 3m 3 2/m

IV/C.07-60 Mengxianminite* (Ca,Na)3(Fe,Mn)2Mg2(Sn,Zn)5Al8O29 Unk Ortho

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Freudenbergite

Na2Fe+++2Ti6O16
Dana No: 7.9.3.1 Strunz No: IV/C.07-20
Locality:

Notes: