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Magnesiotaaffeite-2N’2S

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About Magnesiotaaffeite-2N’2SHide

Formula:
Mg3Al8BeO16
Lustre:
Vitreous
Hardness:
8 - 8½
Specific Gravity:
3.605
Crystal System:
Hexagonal
Name:
Named taaffeite in honor of Count Edward Charles Richard Taaffe, gemologist of Dublin (1898, Bohemia, Austria-Hungary - 1967, Dublin, Ireland), who discovered the mineral in 1945. It was the first case of a new mineral discovered as a facetted gem. The suffix was added by Armbruster et al. (2002) to indicate the polysome.
Taaffeite Group.

The stacking of the spinel-type (Mg2Al4O8) and nolanite-type (BeMgAl4O8) modules is N'SN'S. Malcherek & Schlüter (2016) describe a new polytype of the mineral, Magnesiotaaffeite-2N’2S2, with N'SSN'' stacking sequence; this new polytype crystallizes in the trigonal system, space group P-3m1; it is Cr-bearing.

Visit gemdat.org for gemological information about Magnesiotaaffeite-2N’2S.


Classification of Magnesiotaaffeite-2N’2SHide

Approved, 'Grandfathered' (first described prior to 1959)
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
7.2.11.1

7 : MULTIPLE OXIDES
2 : AB2X4
7.4.5

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

Physical Properties of Magnesiotaaffeite-2N’2SHide

Vitreous
Hardness:
8 - 8½ on Mohs scale
Cleavage:
Imperfect/Fair
Fair {001}
Fracture:
Conchoidal
Density:
3.605 g/cm3 (Measured)    

Optical Data of Magnesiotaaffeite-2N’2SHide

Type:
Uniaxial (+)
RI values:
nω = 1.722 nε = 1.777
Max Birefringence:
δ = 0.055
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of Magnesiotaaffeite-2N’2SHide

Formula:
Mg3Al8BeO16
IMA Formula:
Mg3BeAl8O16

Crystallography of Magnesiotaaffeite-2N’2SHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Cell Parameters:
a = 5.68 Å, c = 18.33 Å
Ratio:
a:c = 1 : 3.227
Unit Cell V:
512.14 ų (Calculated from Unit Cell)
Twinning:
By reflection on (0001)?
Comment:
New polytype (Malcherek & Schlüter, 2016): trigonal, P-3m1, a=5.6788(3), c=18.3368(14), V=512.11, Z=2

Type Occurrence of Magnesiotaaffeite-2N’2SHide

Synonyms of Magnesiotaaffeite-2N’2SHide

Other Language Names for Magnesiotaaffeite-2N’2SHide

Relationship of Magnesiotaaffeite-2N’2S 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’2S2Mg3BeAl8O16Trig. 3m (3 2/m) : P3m1
Magnesiotaaffeite-6N’3SMg2BeAl6O12Trig.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Swedenborgite1 photo of Magnesiotaaffeite-2N’2S associated with Swedenborgite 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-6N’3SMg2BeAl6O12Trig.

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)
7.4.6Magnesiotaaffeite-6N’3SMg2BeAl6O12Trig.
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-2N’2SHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Anderson, B.W., Payne, C.J., Claringbull, G.F., Hey, M.H. (1951) Taaffeite, a new beryllium mineral, found as a cut gemstone. Mineralogical Magazine: 29: 765-772.
Kozhevnikov et al. (1975) First taaffeite in the USSR. Dokl. Akad. Nauk, SSSR, Earth Sci. Sect.: 224: 120-121.
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.
Schmetzer (1983) Crystal chemistry of natural Be-Mg-Al-oxides: taaffeite, taprobanite, musgravite. Neues Jahrbuch für Mineralogie, Abhandlungen: 146: 15-28.
Guinier, A., Bokij, G.B., Boll-Dornberger, K., Cowley, J.M., Durovic, S., Jagodzinski, H., Krishna, P., DeWolff, P.M., Zvyagin, B.B., Cox, D.E., Goodman, P., Hahn, Th., Kuchitsu, K., Abrahams, S.C. (1984) Nomenclature of polytype structures. Report of the International Union of Crystallography ad-hoc committee on the Nomenclature of discordered, modulated and polytype structures. Acta Crystallographica: A40: 399-404.
Armbruster, T. (2002) Revised nomenclature of högbomite, nigerite, and taafeite minerals. European Journal of Mineralogy: 14: 389-395.
Schmetzer, K. (2005) Iron- and zinc rich gem-quality taaffeites from Sri Lanka. Journal of Gemmology: 29: 290-298.
Kampf, A.R. (1991) Taaffeite Crystals. Mineralogical Record 22: 343-347.
Bernhard, F., Hauzenberger, C., Walter, F., Kristiansen, R. (2008) Pseudosinhalite, magnesiotaaffeite-6N'3S and magnesiotaaffeite-2N'2S as replacement products of spinel in dolomite marble from Stubenberg, Styria, Austria. The Canadian Mineralogist: 46: 1195-1205.
Malcherek, T. and Schlüter, J. (2016) Crystal structure of Cr-bearing Mg3BeAl8O16, a new polytype of magnesiotaaffeite-2N′2S. Acta Crystallographica: E72: 1060-1063.

Internet Links for Magnesiotaaffeite-2N’2SHide

Localities for Magnesiotaaffeite-2N’2SHide

ⓘ - 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.
Australia
 
  • South Australia
    • Flinders Ranges
      • North Flinders Ranges
        • Arkaroola Region (Arkaroola Wilderness Sanctuary; Arkaroola Station)
Mineralogical Magazine, 1980, 43:575-577.
Austria
 
  • Styria
    • Weiz
      • Stubenberg am See
Bernhard, F. et al. (2008)
China
 
  • Hunan Province
    • Chenzhou Prefecture
      • Linwu Co.
        • Xianghualing Sn-polymetallic ore field
Huang et al. (1988): Hsianghualing rocks, mineral deposits and minerals. Beijing Sci. Techn. Publ. Bur. (Beijing), 255 pp.; AM 44 (1959), 1327; European Journal of Mineralogy 10 (1998), 1037; Michael O’Donoghue, Gems, Sixth edition (2006), p.457
Yuzhou Li (1990): Geology and Prospecting 26(6), 29-35
      • Yizhang Co.
        • Dongpo ore field
Shimou Chen, Hongchang Li, Ciguo Xie, and Shangjing Ai (1981): Geology and Prospecting 17(10), 15-21; Yuzhou Li (1990): Geology and Prospecting 26(6), 29-35; Huanzhang Tian (1982): Geology and Prospecting 18(11), 2-8; Zhijun Shen, Linglin Xie, and Zhengyu Quan (2003): Hunan Geology 22(1), 30-33, 63
Madagascar
 
  • Antananarivo Province
    • Vakinankaratra Region
      • Antsirabe II District
        • Mangarano Commune
Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse Toulouse 3, no. 86 TOU3 0210, Toulouse, 240 p.
Ranorosoa, N. (1986): Etude mineralogique des pegmatites du champ de la Sahatany, Madagascar. These de Doctorat de l`Universite Paul Sabatier, Toulouse Toulouse 3, no. 86 TOU3 0210, Toulouse, 240 p.
Myanmar
 
  • Mandalay Region (Mandalay Division)
    • Pyin-Oo-Lwin District
      • Mogok Township
Harald Schillhammer collection
        • Kyatpyin North
Ted Themelis (2008) Gems & mines of Mogok
        • Mogok Valley
Pavel M. Kartashov analytical data, Sieghard Ellenberger specimens
Russia
 
  • Karelia Republic
    • Ladoga Region
Schmetzer (1983): Crystal chemistry of natural Be-Mg-Al-oxides: taaffeite, taprobanite, musgravite. Neues Jahrbuch für Mineralogie, Abhandlungen: 146: 15-28.
Sri Lanka
 
  • Central Province
Fernando, G. W. A. R., Attanayake, A. N. B., & Hofmeister, W. (2005, September). Corundum-spinel-taafeite-scheelite bearing metasomatites in Bakamuna, Sri Lanka: modeling its formation. In Gem materials and modern analytical methods” Proceedings of the International Symposium. Hanoi (pp. 117-122).
  • Sabaragamuwa Province
    • Ratnapura District
Natural History Museum Vienna collection
      • Ratnapura
http://www.multicolour.com/taaffeite.html
Mineralogical Magazine(1951) 29, 765-772; Neues Jahrb.Min.,Abh.(1983) 146, 15-28
Sweden
 
  • Värmland
    • Filipstad
Kjell Gatedal; Nysten,P. & Gustafsson, L.(2006): I jakt på sällsynta mineral. Geologiskt forum nr 49, 22-25
Tanzania
 
  • Ruvuma Region
    • Tunduru District
Thomas, A. (2008) Gemstones properties, identification and use. New Holland Publishers, Cape Town, 256 pp
USA
 
  • Virginia
    • Rockbridge Co.
Minerals of Virginia 1990 by R. V. Dietrich
Mineral and/or Locality  
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