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Magnesiotaaffeite-6N’3S

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About Magnesiotaaffeite-6N’3SHide

Formula:
Mg2BeAl6O12
Hardness:
8 - 8½
Crystal System:
Trigonal
Name:
Defined by Armbruster et al. (2002) as a polysome of magnesiotaaffeite. Prior to that it was known as musgravite. The root name is in honor of Count Edward Charles Richard Taaffe, gemologist of Dublin (1898, Bohemia - 1967).

Classification of Magnesiotaaffeite-6N’3SHide

Approved
4.FC.25

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
C : Hydroxides with OH, without H2O; corner-sharing octahedra
7.2.12.1

7 : MULTIPLE OXIDES
2 : AB2X4
7.4.6

7 : Oxides and Hydroxides
4 : Oxides of Be, Mg and the alkaline earths

Physical Properties of Magnesiotaaffeite-6N’3SHide

Hardness:
8 - 8½ on Mohs scale

Optical Data of Magnesiotaaffeite-6N’3SHide

Type:
Uniaxial (-)
RI values:
nω = 1.739 nε = 1.735
Max Birefringence:
δ = 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of Magnesiotaaffeite-6N’3SHide

Formula:
Mg2BeAl6O12

Crystallography of Magnesiotaaffeite-6N’3SHide

Crystal System:
Trigonal
Cell Parameters:
a = 5.67 Å, c = 41.09 Å
Ratio:
a:c = 1 : 7.247
Unit Cell V:
1,144.02 ų (Calculated from Unit Cell)

Type Occurrence of Magnesiotaaffeite-6N’3SHide

Synonyms of Magnesiotaaffeite-6N’3SHide

Other Language Names for Magnesiotaaffeite-6N’3SHide

Relationship of Magnesiotaaffeite-6N’3S to other SpeciesHide

Other Members of this group:
Ferrotaaffeite-2N’2SBe(Fe,Mg,Zn)3Al8O16 Hex. 6mm : P63mc
Ferrotaaffeite-6N'3S(Be,Zn,Mg)FeAl4O8Trig.
Magnesiotaaffeite-2N’2SMg3Al8BeO16Hex. 6/mmm (6/m 2/m 2/m)
Magnesiotaaffeite-2N’2S2Mg3BeAl8O16Trig. 3m (3 2/m) : P3m1

Common AssociatesHide

Associated Minerals Based on Photo Data:
Pseudosinhalite2 photos of Magnesiotaaffeite-6N’3S associated with Pseudosinhalite on mindat.org.
Spinel2 photos of Magnesiotaaffeite-6N’3S associated with Spinel on mindat.org.
Magnetite1 photo of Magnesiotaaffeite-6N’3S associated with Magnetite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.FC.05BernaliteFe(OH)3 · nH2O (n = 0.0 to 0.25)Orth. mmm (2/m 2/m 2/m) : Pmmn
4.FC.05DzhalinditeIn(OH)3Iso.
4.FC.05SöhngeiteGa(OH)3Tet.
4.FC.10BurtiteCa[Sn(OH)6]Iso.
4.FC.10Mushistonite(Cu,Zn,Fe2+)[Sn(OH)6]
4.FC.10NataniteFe2+[Sn(OH)6]Iso. m3m (4/m 3 2/m) : Pn3m
4.FC.10SchoenfliesiteMg[Sn(OH)6]Iso. m3 (2/m 3) : Pn3
4.FC.10VismirnoviteZn[Sn(OH)6]Iso.
4.FC.10WickmaniteMn2+[Sn(OH)6]Iso. m3 (2/m 3) : Pn3
4.FC.15JeanbandyiteFe3+xFe2+1-xSn(OH)6-xOx (1 ≥ x > 0.5)Tet. 4/m : P42/n
4.FC.15MopungiteNa[Sb5+(OH)6]Tet. 4/m : P42/n
4.FC.15StottiteFe2+[Ge4+(OH)6]Tet.
4.FC.15TetrawickmaniteMn2+[Sn4+(OH)6]Tet. 4/m : P42/n
4.FC.20Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)Trig. 3m (3 2/m) : P3m1
4.FC.20Magnesionigerite-6N6S(Mg,Al,Zn)3(Al,Sn,Fe)8O15(OH)Trig. 3m (3 2/m) : R3m
4.FC.20Magnesionigerite-2N1S(Mg,Al,Zn)2(Al,Sn)6O11(OH)Trig. 3m (3 2/m) : P3m1
4.FC.20Ferronigerite-6N6S(Al,Fe,Zn)3(Al,Sn,Fe)8O15(OH)Trig. 3m (3 2/m) : R3m
4.FC.20Zinconigerite-2N1S(Zn,Al,Mg)2(Al,Sn)6O11(OH)Trig. 3m (3 2/m) : P3m1
4.FC.20Zinconigerite-6N6S(Zn,Mg,Al)3(Al,Sn,Fe)8O15(OH)Trig. 3m (3 2/m) : R3m
4.FC.25Magnesiotaaffeite-2N’2SMg3Al8BeO16Hex. 6/mmm (6/m 2/m 2/m)

Related Minerals - Dana Grouping (8th Ed.)Hide

7.2.12.2Ferrotaaffeite-6N'3S(Be,Zn,Mg)FeAl4O8Trig.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.4.1BromelliteBeOHex. 6mm : P63mc
7.4.2BehoiteBe(OH)2Orth. 2 2 2 : P21 21 21
7.4.3ClinobehoiteBe(OH)2Mon. 2 : P21
7.4.4ChrysoberylBeAl2O4Orth. mmm (2/m 2/m 2/m)
7.4.5Magnesiotaaffeite-2N’2SMg3Al8BeO16Hex. 6/mmm (6/m 2/m 2/m)
7.4.7PericlaseMgOIso. m3m (4/m 3 2/m) : Fm3m
7.4.8BruciteMg(OH)2Trig. 3m (3 2/m) : P3m1
7.4.9SpinelMgAl2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.4.10MeixneriteMg6Al2(OH)16(OH)2 · 4H2OTrig. 3m (3 2/m) : R3m
7.4.11LimeCaOIso. m3m (4/m 3 2/m)
7.4.12PortlanditeCa(OH)2Trig. 3m (3 2/m)
7.4.13ChlormayeniteCa12Al14O32[◻4Cl2]Iso. 4 3m : I4 3d
7.4.14HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2OMon. 2 : P21
7.4.15MarokiteCaMn3+2O4Orth.
7.4.16Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2OTrig. 3 : P3
7.4.17HollanditeBa(Mn4+6Mn3+2)O16Mon. 2/m
7.4.18Romanèchite(Ba,H2O)2(Mn4+,Mn3+)5O10Mon. 2/m
7.4.19Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2OMon. 2/m : P2/m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Magnesiotaaffeite-6N’3SHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nuber, B., Schmetzer, K. (1983) Crystal structures of ternary Be-Mg-Al oxides: taaffeite, BeMg3Al8O16, and musgravite, BeMg2Al6O12. Neues Jahrbuch für Mineralogie, Monatshefte: 1983: 393-402.
Neues Jahrbuch für Mineralogie, Abhandlungen: 146: 15-28.
Kiefert, L. and Schmetzer, K. (1998) Distinction of taaffeite and musgravite. Journal of Gemmology: 26: 165-167.
Armbruster, T. (2002) Revised nomenclature of högbomite, nigerite, and taafeite minerals. European Journal of Mineralogy: 14: 389-395.
Schmetzer, K. Kiefert, L., Bernhardt, H.-J., Burford, M. (2005) Musgravites from Sri Lanka. Neues Jahrbuch Miner. Abh.: 181(3): 265-270 (localities).
Schmetzer, K. Krzemnicki, M.S., Hanni, H.A., Bernhardt, H.-J., Pettke, T. (2005) Gem-quality musgravite from Sri Lanka. Journal of Gemmology: 29: 281-289.

Internet Links for Magnesiotaaffeite-6N’3SHide

Localities for Magnesiotaaffeite-6N’3SHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Antarctica
 
  • Eastern Antarctica
    • Enderby Land
      • Napier Complex
        • Casey Bay
          • Khmara Bay
PLEASE ADD REFERENCE
Grew, E. S. (1981): Surinamite, taafeite and beryllian sapphirine from pegmatites in granulite-facies rocks of Casey Bay, Enderby Land, Antarctica. American Mineralogist, 66, 1022-1033
Australia (TL)
 
  • South Australia
    • North West Province
      • Musgrave Ranges
MM 1967, 305-10
Austria
 
  • Styria
    • Weiz
      • Stubenberg am See
Bernhard, F. et al. (2008)
Denmark
 
  • Greenland
    • Northeast Greenland National Park
      • Dove Bugt
Chadwick, B., Friend, C. R. L, George, M.C. and Perkins, W.T. (1993): A New Occurrence of Musgravite, a Rare Beryllium Oxide, in the Caledonides of North-East Greenland.Mineralogical Magazine. 57 : 121-129. ; Friend, C., George, M., & Perkins, W. (1993). A new occurrence of musgravite, a rare beryllium oxide, in the Caledonides of North-East Greenland. Mineralogical Magazine, 57, 121-129.
France
 
  • Occitanie
    • Pyrénées-Orientales
      • Prats-de-Mollo-la Preste (Prats de Molló-la Presta)
Dubru. M, (1986) Pétrologie et géochimie du marbre à brucite et des borates associés au gisement de tungstène de Costabonne, (Pyrénées orientales, France) 930p
Madagascar
 
  • Fianarantsoa Province
    • Ihorombe Region
      • Ihosy District
        • Mahasoa Commune
Devouard, B. et al. (2002): Occurrence of musgravite in anorthite-corundum-spinel-sapphirine rocks ("sakenites") from South Madagascar : Evidence for a high-grade metasomatic event. 18th General Meeting of the IMA, Sept. 2002, Edinburgh, Scotland.
        • Sahambano Commune
http://fonjatany-mth.com/pdf/etudes/annexes_rapport.pdf
Tanzania
 
  • Ruvuma Region
    • Tunduru District
Schmetzer,k.,Krzemnicki,M.,Hanni,H.,Bernhardt,H., and Pettke, T., (2007) Gem-quality taaffeites and musgravites from Africa, Journal of Gemmology, 30(7/8), 367-382.
Mineral and/or Locality  
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