Ferrotaaffeite-6N3S Mineral Data

Ferrotaaffeite-6N3S Mineral Data

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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

Diaphaniety:

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

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:

r_electron=3.93 gm/cc
note: r_{Ferrotaaffeite-6N3S}=4.05 gm/cc.

Fermion Index

Fermion Index = 0.02396
Boson Index = 0.97604

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferrotaaffeite-6N3S is Not Radioactive

Ferrotaaffeite-6N3S Classification

Dana Class:

7.2.12.2 (7)Multiple Oxides

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

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

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

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

Strunz Class:

IV/B.07-40 IV - Oxides

IV/B - Oxides with metal : oxygen = 3:4 (spinel type M3O4 and related)

IV/B.07 - Chrysoberyl - Swedenburgite series

IV/B.07-10 Chrysoberyl BeAl2O4 Pmnb 2/m 2/m 2/m

IV/B.07-20 Magnesiotaaffeite-2N2S Mg3Al8BeO16 P 6₃mc 6mm

IV/B.07-30 Magnesiotaaffeite-6N3S (Mg,Fe,Zn)2Al6BeO12 R 3m 3 2/m

IV/B.07-40 Ferrotaaffeite-6N3S (Fe,Zn,Mg)2Al6BeO12 R 3m 3 2/m

IV/B.07-50 Swedenborgite NaBe4SbO7 P 6₃mc 6mm

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Ferrotaaffeite-6N3S

(Fe++,Zn,Mg)2Al6BeO12
Dana No: 7.2.12.2 Strunz No: IV/B.07-40
Locality:

Notes: