Magnesiotaaffeite-2N2S Mineral Data

Magnesiotaaffeite-2N2S Mineral Data

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General Magnesiotaaffeite-2N2S Information

Chemical Formula:

Mg3Al8BeO16

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

Empirical Formula:

Mg₃Al₈BeO₁₆

Environment:

Found in the gem gravels of Sri Lanka.

IMA Status:

Approved IMA 1982

Locality:

Niriella Village, Ratnapura, Sri Lanka. 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

Taaffeite

Magnesiotaaffeite-2N2S Image

Images:

Click Here for Larger Magnesiotaaffeite-2N2S Image

Magnesiotaaffeite-2N2S Taaffeite

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

Magnesiotaaffeite-2N2S Crystallography

Axial Ratios:

a:c = 1:3.21616

Cell Dimensions:

a = 5.69, c = 18.3, Z = 2; V = 513.11 Den(Calc)= 3.58

Crystal System:

Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 6₃mc

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

By Intensity(I/I_o): 2.43(1), 1.428(0.8), 2.05(0.8),

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 taaffeite-8H, Locality: Miriella Village, Ratnapura, Sri Lanka

Physical Properties of Magnesiotaaffeite-2N2S

Cleavage:

None

Color:

Colorless, Violet red, Greenish, Light green, Pink violet.

Density:

3.6 - 3.613, Average = 3.6

Diaphaniety:

Transparent to Translucent

Hardness:

8-8.5 - Between Topaz and Chrysoberyl

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Magnesiotaaffeite-2N2S

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

Optical Data:

Uniaxial (+), w=1.722, e=1.777, bire=0.0550.

Calculated Properties of Magnesiotaaffeite-2N2S

Electron Density:

r_electron=3.54 gm/cc
note: r_{Magnesiotaaffeite-2N2S}=3.61 gm/cc.

Fermion Index

Fermion Index = 0.02966
Boson Index = 0.97034

Photoelectric:

PE_{Magnesiotaaffeite-2N2S}= 1.44 barns/electron
U=PE_{Magnesiotaaffeite-2N2S} x r_electron= 5.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesiotaaffeite-2N2S is Not Radioactive

Magnesiotaaffeite-2N2S Classification

Dana Class:

7.2.11.1 (7)Multiple Oxides

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

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

7.2.11.1 Magnesiotaaffeite-2N2S Mg3Al8BeO16 P 6₃mc 6mm

Strunz Class:

IV/B.07-20 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-2N2S Information

References:

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

See Also:

Links to other databases for Magnesiotaaffeite-2N2S :
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-2N2S

Mg3Al8BeO16
Dana No: 7.2.11.1 Strunz No: IV/B.07-20
Locality:

Notes: