Magnesiotaaffeite-2N2S Mineral Data

[Newest Minerals] [Minerals for Sale] [Educational Articles] [About Us] [Image Gallery]
John Betts - Fine Minerals
Classic minerals, out-of-print books & magazines, plus informative articles for collectors

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:

Magnesiotaaffeite-2N2S

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

Images:

Magnesiotaaffeite-2N2S Magnesiotaaffeite-6N3S 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

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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
Ncalc = 1.74 - 1.75

Optical Data:

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

Calculated Properties of Magnesiotaaffeite-2N2S

Electron Density:

Bulk Density (Electron Density)=3.54 gm/cc
note: Specific Gravity of Magnesiotaaffeite-2N2S =3.61 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Magnesiotaaffeite-2N2S is Not Radioactive

Magnesiotaaffeite-2N2S Classification

Dana Class:

07.02.11.01 (07)Multiple Oxides

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

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

07.02.11.01 Magnesiotaaffeite-2N2S Mg3Al8BeO16 P 6₃mc 6mm

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

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
10 - Ruff.Info

Search for Magnesiotaaffeite-2N2S using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Magnesiotaaffeite-2N2S :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Magnesiotaaffeite-2N2S Mineral Data :

Ask about Magnesiotaaffeite-2N2S here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Magnesiotaaffeite-2N2S Specimen Label here :

Magnesiotaaffeite-2N2S

Mg3Al8BeO16
Dana No: 07.02.11.01 Strunz No: 04.FC.25
Locality:

Notes: