Freudenbergite Mineral Data

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.

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

Search for Freudenbergite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Freudenbergite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Freudenbergite Mineral Data :

Ask about Freudenbergite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Freudenbergite

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

Notes: