Ferrotaaffeite-6N3S Mineral Data

General Ferrotaaffeite-6N3S Information

Chemical Formula:

(Fe++,Zn,Mg)2Al6BeO12

Composition:

Molecular Weight = 470.24 gm

Magnesium 1.03 % Mg 1.71 % MgO

Beryllium 1.72 % Be 4.79 % BeO

Aluminum 34.43 % Al 65.05 % Al₂O₃

Zinc 4.17 % Zn 5.19 % ZnO

Iron 17.81 % Fe 22.92 % FeO

Oxygen 40.83 % O

______ ______

100.00 % 99.66 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_1.5Zn_0.3Mg_0.2Al₆Be_0.9O₁₂

Environment:

Wall zone of a granitic pegmatite in "hornblende" gabbro. Renamed from pehrmanite.

IMA Status:

Approved IMA 1981

Locality:

Rosendal pegmatite, Kemio (Kimito) Island, southwestern Finland. Link to MinDat.org Location Data.

Name Origin:

Named as the FERRous analog of magnesiotaaffeite. (S=Spinel, N=Nolanite Layers).

Synonym:

IMA2001-A

Pehrmanite

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Ferrotaaffeite-6N3S Crystallography

Axial Ratios:

a:c = 1:7.22105

Cell Dimensions:

a = 5.7, c = 41.16, Z = 6; V = 1,158.13 Den(Calc)= 4.05

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.422(1), 2.856(0.8), 1.426(0.5),

Physical Properties of Ferrotaaffeite-6N3S

Cleavage:

{???} Indistinct

Color:

Light green.

Density:

4.07

Diaphaneity:

Semitransparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

8-8.5 - Between Topaz and Chrysoberyl

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ferrotaaffeite-6N3S

Dichroism (e):

pale grayish brown.

Dichroism (w):

pale greenish.

Gladstone-Dale:

CI meas= 0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1951,KPDmeas= 0.1941,KC= 0.2009
Ncalc = 1.81 - 1.82

Optical Data:

Uniaxial (-), w=1.79.

RL Anisotrophism:

Very weak.

RL Color:

Gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Ferrotaaffeite-6N3S in Air**
λ	R	∑ R(λ)
470 nm	8.34
546 nm	8.11
589 nm	8.01
650 nm	7.86

**Calculated Relative Intensity Colors of Ferrotaaffeite-6N3S in Air**
Relative Intensity	0%	100%	200%	300%	400%	500%	600%	700%	800%	900%	1000%
R

Calculated Properties of Ferrotaaffeite-6N3S

Electron Density:

Bulk Density (Electron Density)=3.93 gm/cc
note: Specific Gravity of Ferrotaaffeite-6N3S =4.05 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Ferrotaaffeite-6N3S}= 8.44 barns/electron
U=PE_{Ferrotaaffeite-6N3S} x rElectron Density= 33.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ferrotaaffeite-6N3S is Not Radioactive

Ferrotaaffeite-6N3S Classification

Dana Class:

07.02.12.02 (07)Multiple Oxides

(07.02)(A+ B++)2 X4 Spinel group

(07.02.12)Taaffeite Group (T2 = Be + T)

07.02.12.01 Magnesiotaaffeite-6N3S! (Mg,Fe,Zn)2Al6BeO12 R 3m 3 2/m

07.02.12.02 Ferrotaaffeite-6N3S (Fe,Zn,Mg)2Al6BeO12 R 3m 3 2/m

Strunz Class:

04.FC.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FC -Hydroxides with OH, without H2O; corner-sharing octahedra

04.FC.25 Magnesiotaaffeite-6N3S! (Mg,Fe,Zn)2Al6BeO12 R 3m 3 2/m

04.FC.25 Magnesiotaaffeite-2N2S Mg3Al8BeO16 P 6₃mc 6mm

04.FC.25 Ferrotaaffeite-6N3S (Fe,Zn,Mg)2Al6BeO12 R 3m 3 2/m

Other Ferrotaaffeite-6N3S Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Ferrotaaffeite-6N3S :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Ferrotaaffeite-6N3S Specimen Label here :

Ferrotaaffeite-6N3S

(Fe++,Zn,Mg)2Al6BeO12
Dana No: 07.02.12.02 Strunz No: 04.FC.25
Locality:

Notes: