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About Magnesiotaaffeite-6N’3SHide

Colorles to pale shades of olive-green
Vitreous, Sub-Vitreous
8 - 8½
Crystal System:
Re-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


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

2 : AB2X4

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

Physical Properties of Magnesiotaaffeite-6N’3SHide

Vitreous, Sub-Vitreous
Transparent, Translucent
Colorles to pale shades of olive-green
8 - 8½ on Mohs scale

Optical Data of Magnesiotaaffeite-6N’3SHide

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:

Chemical Properties of Magnesiotaaffeite-6N’3SHide


Crystallography of Magnesiotaaffeite-6N’3SHide

Crystal System:
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
Cell Parameters:
a = 5.67 Å, c = 41.09 Å
a:c = 1 : 7.247
Unit Cell V:
1,144.02 ų (Calculated from Unit Cell)

Type Occurrence of Magnesiotaaffeite-6N’3SHide

General Appearance of Type Material:
Light colored vitreous translucent mineral
Associated Minerals at Type Locality:

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)3Al8O16Hex. 6mm : P63mc
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:
2 photos of Magnesiotaaffeite-6N’3S associated with PseudosinhaliteMg2Al3(BO3)2(OH)O3
2 photos of Magnesiotaaffeite-6N’3S associated with SpinelMgAl2O4
1 photo of Magnesiotaaffeite-6N’3S associated with MagnetiteFe2+Fe3+2O4

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.10Mushistonite(Cu,Zn,Fe2+)[Sn(OH)6]Iso. m3m (4/m 3 2/m) : Pn3m
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.10WickmaniteMn2+[Sn(OH)6]Iso. m3 (2/m 3) : Pn3
4.FC.15JeanbandyiteFe3+xFe2+1-xSn(OH)6-xOxTet. 4/m : P42/n
4.FC.15MopungiteNa[Sb5+(OH)6]Tet. 4/m : P42/n
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-6N6SZn3Sn2Al16O30(OH)2Trig. 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'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
7.4.16Ranciéite(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

Fluorescence of Magnesiotaaffeite-6N’3SHide

Unknown if any has been tested in UV

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.
  • Eastern Antarctica
    • Enderby Land
      • Napier Complex
        • Casey Bay
          • Khmara Bay
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
  • Styria
    • Hartberg-Fürstenfeld District
      • Stubenberg am See
Bernhard, F. et al. (2008)
  • Occitanie
    • Pyrénées-Orientales
      • Céret
        • Prats-de-Mollo-la-Preste
Dubru. M, (1986) Pétrologie et géochimie du marbre à brucite et des borates associés au gisement de tungstène de Costabonne, (Pyrénées orientales, France) 930p
  • Sermersooq
    • 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.
  • Ihorombe
    • Ihosy
      • Mahasoa
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
  • 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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