Magnesiotaaffeite-6N3S Mineral Data

Magnesiotaaffeite-6N3S Mineral Data

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General Magnesiotaaffeite-6N3S Information

Chemical Formula:

(Mg,Fe++,Zn)2Al6BeO12

Composition:

Molecular Weight = 426.60 gm

Magnesium 9.69 % Mg 16.06 % MgO

Beryllium 1.90 % Be 5.28 % BeO

Aluminum 37.95 % Al 71.70 % Al₂O₃

Zinc 1.53 % Zn 1.91 % ZnO

Iron 3.93 % Fe 5.05 % FeO

Oxygen 45.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_1.7Fe²⁺_0.3Zn_0.1Al₆Be_0.9O₁₂

Environment:

In a nodule, perhaps formerly a corundum crystal, in high-grade metapyroxinite, metaperidotites, and granulites. Renamed from musgravite.

IMA Status:

Approved IMA 2002

Locality:

Located 16 km north-northeast of Ernambella Mission, Musgrave Ranges, South Australia. Link to MinDat.org Location Data.

Name Origin:

Named for Count R.Taaffe of Dublin, Ireland, who discovered the mineral in 1945. (S=Spinel, N=Nolanite Layers).

Synonym:

IMA2001-A

Musgravite

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Magnesiotaaffeite-6N3S Crystallography

Axial Ratios:

a:c = 1:7.24158

Cell Dimensions:

a = 5.675, c = 41.096, Z = 6; V = 1,146.20 Den(Calc)= 3.71

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): 2.408(1), 1.419(0.8), 2.052(0.7),

Crystal Structure:

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Nuber B , Schmetzer K , Neues Jahrbuch fur Mineralogie, Monatshefte , 1983 (1983) p.393-402, Crystal structure of ternary Be-Mg-Al oxides: taaffeite, BeMg3Al8O16,, and musgravite, BeMg2Al6O12, Note: formerly known as musgravite-18R, Locality: Musgrave Ranges, Australia

View Additional jPOWD Structure files for Magnesiotaaffeite-6N3S
[1]

Physical Properties of Magnesiotaaffeite-6N3S

Cleavage:

[0001] Perfect, [1011] Parting

Color:

Light olive green.

Density:

3.68

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

8-8.5 - Between Topaz and Chrysoberyl

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Magnesiotaaffeite-6N3S

Gladstone-Dale:

CI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1987,KPDmeas= 0.2003,KC= 0.2057

Optical Data:

Uniaxial (-), e=1.735, w=1.739, bire=0.0040.

Calculated Properties of Magnesiotaaffeite-6N3S

Electron Density:

r_electron=3.60 gm/cc
note: r_{Magnesiotaaffeite-6N3S}=3.68 gm/cc.

Fermion Index

Fermion Index = 0.03037
Boson Index = 0.96963

Photoelectric:

PE_{Magnesiotaaffeite-6N3S}= 3.25 barns/electron
U=PE_{Magnesiotaaffeite-6N3S} x r_electron= 11.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesiotaaffeite-6N3S is Not Radioactive

Magnesiotaaffeite-6N3S Classification

Dana Class:

7.2.12.1 (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.07-30 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 Magnesiotaaffeite-6N3S Information

References:

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

See Also:

Links to other databases for Magnesiotaaffeite-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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Magnesiotaaffeite-6N3S

(Mg,Fe++,Zn)2Al6BeO12
Dana No: 7.2.12.1 Strunz No: IV/B.07-30
Locality:

Notes: