Magnesiotaaffeite-6N3S Mineral Data
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 % Al2 O3
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:
Mg1.7 Fe2+ 0.3 Zn0.1 Al6 Be0.9 O12
Environment:
In a nodule, perhaps formerly a corundum crystal, in high-grade metapyroxinite, metaperidotites, and granulites. Renamed from musgravite.
IMA Status:
Approved IMA 2002 (Dana # Added)
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
Magnesiotaaffeite-6N3S Image
Images:
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 Scalenohedral H-M Symbol (3 2/m) Space Group: R 3 m
X Ray Diffraction:
By Intensity(I/Io ): 2.408(1), 1.419(0.8), 2.052(0.7),
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 Ncalc = 1.76
Optical Data:
Uniaxial (-), e=1.735, w=1.739, bire=0.0040.
Calculated Properties of Magnesiotaaffeite-6N3S
Electron Density:
Bulk Density (Electron Density)=3.60 gm/cc note: Specific Gravity of Magnesiotaaffeite-6N3S =3.68 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEMagnesiotaaffeite-6N3S = 3.25 barns/electronU=PEMagnesiotaaffeite-6N3S x r Electron Density= 11.72 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Magnesiotaaffeite-6N3S is Not Radioactive
Magnesiotaaffeite-6N3S Classification
Dana Class:
07.02.12.01 (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 3 m 3 2/m
07.02.12.02 Ferrotaaffeite-6N3S (Fe,Zn,Mg)2Al6BeO12 R 3 m 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 3 m 3 2/m
04.FC.25 Magnesiotaaffeite-2N2S Mg3Al8BeO16 P 63 mc 6mm
04.FC.25 Ferrotaaffeite-6N3S (Fe,Zn,Mg)2Al6BeO12 R 3 m 3 2/m
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 - 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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Magnesiotaaffeite-6N3S
(Mg,Fe++,Zn)2Al6BeO12
Dana No: 07.02.12.01 Strunz No: 04.FC.25
Locality:
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