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Magnesiotaaffeite-2N2S Mineral Data

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General Magnesiotaaffeite-2N2S Information

Help on Chemical  Formula: Chemical Formula: Mg3Al8BeO16
Help on Composition: Composition: Molecular Weight = 553.77 gm
   Magnesium  13.17 %  Mg   21.83 % MgO
   Beryllium   1.63 %  Be    4.52 % BeO
   Aluminum   38.98 %  Al   73.65 % Al2O3
   Oxygen     46.23 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg3Al8BeO16
Help on Environment: Environment: Found in the gem gravels of Sri Lanka.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Niriella Village, Ratnapura, Sri Lanka. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Count R.Taaffe of Dublin, Ireland, who discovered the mineral in 1945. (S=Spinel, N=Nolanite Layers).
Help on Synonym: Synonym: IMA2001-A

Magnesiotaaffeite-2N2S Image

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Comments: Faucetted purple magnesiotaaffeite. These specimens are very rare and un-cut samples ever rarer..
Location: Ceylon gem gravels, Ratnapura, Sri Lanka. Scale: See Image.
© Dave Barthelmy

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  Magnesiotaaffeite-6N3S   Magnesiotaaffeite-2N2S   Taaffeite

Comments: BSE image of magnesiotaaffeite-6N3S (Mgt-6N3S) with a central lamella of magnesiotaaffeite-2N2S (Mgt-2N2S). Other minerals Spl: spinel; Chl: clinochlore.
Location: Polymetamorphic dolomite marble at Eastern Alps, Stubenberg, Styria, Austria. (CanMin, v46:1195). Scale: See Image.
© Canadian Mineralogist

Magnesiotaaffeite-2N2S Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:3.21616
Help on Cell Dimensions: Cell Dimensions: a = 5.69, c = 18.3, Z = 2; V = 513.11 Den(Calc)= 3.58
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Pyramidal H-M Symbol (6mm) Space Group: P 63mc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.43(1), 1.428(0.8), 2.05(0.8),

Physical Properties of Magnesiotaaffeite-2N2S

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Violet red, Greenish, Light green, Pink violet.
Help on Density: Density: 3.6 - 3.613, Average = 3.6
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 8-8.5 - Between Topaz and Chrysoberyl
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Magnesiotaaffeite-2N2S

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2094,KPDmeas= 0.2078,KC= 0.207
Ncalc = 1.74 - 1.75
Help on Optical Data: Optical Data: Uniaxial (+), w=1.722, e=1.777, bire=0.0550.

Calculated Properties of Magnesiotaaffeite-2N2S

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.54 gm/cc
note: Specific Gravity of Magnesiotaaffeite-2N2S =3.61 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEMagnesiotaaffeite-2N2S = 1.44 barns/electron
U=PEMagnesiotaaffeite-2N2S x rElectron Density= 5.11 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Magnesiotaaffeite-2N2S is Not Radioactive

Magnesiotaaffeite-2N2S Classification

Help on  Dana Class: Dana Class: (07)Multiple Oxides
  (07.02)(A+ B++)2 X4 Spinel group
  (07.02.11)Taaffeite Group (T2 = Be + T) Magnesiotaaffeite-2N2S Mg3Al8BeO16 P 63mc 6mm
Help on  Strunz Class: 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 Magnesiotaaffeite-2N2S Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Magnesiotaaffeite-2N2S :
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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Dana No: Strunz No: 04.FC.25





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