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Ellenbergerite

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Formula:
Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10
Hardness:
Crystal System:
Hexagonal
Name:
Named by R. Klaska in 1985 in honor of François Ellenberger (5 May 1915, Lealui, Northern Rhodesia (now Zambia) - 11 January 2000, Bures-sur-Yvette, France), Professor of Structural Geology, University of the Sorbonne, Paris, for his work in the western Alps.
The Type Locality is indicated as Case Parigi (better Case Paris as known "in loco") but the classic outcrop is very near to Case Ramello.

Closely related to phosphoellenbergerite. Compare 'ellenbergerite-(PO4)'.


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Classification of EllenbergeriteHide

Approved
Approval Year:
1984
9.AF.80

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
52.4.10.1

52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
16.14.10

16 : Silicates Containing Aluminum and other Metals
14 : Aluminosilicates of Ti, Zr, Sn and Pb

Pronounciation of EllenbergeriteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of EllenbergeriteHide

Hardness:
6½ on Mohs scale

Optical Data of EllenbergeriteHide

Type:
Uniaxial (-)
RI values:
nω = 1.655 - 1.679 nε = 1.654 - 1.670
Max Birefringence:
δ = 0.002 - 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of EllenbergeriteHide

Formula:
Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10
Common Impurities:
Zr,Fe,P

Crystallography of EllenbergeriteHide

Crystal System:
Hexagonal
Cell Parameters:
a = 12.25 Å, c = 4.93 Å
Ratio:
a:c = 1 : 0.402
Unit Cell V:
640.69 ų (Calculated from Unit Cell)

Type Occurrence of EllenbergeriteHide

Synonyms of EllenbergeriteHide

Other Language Names for EllenbergeriteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Rutile4 photos of Ellenbergerite associated with Rutile on mindat.org.
Magnesiostaurolite3 photos of Ellenbergerite associated with Magnesiostaurolite on mindat.org.
Coesite1 photo of Ellenbergerite associated with Coesite on mindat.org.
Pyrope1 photo of Ellenbergerite associated with Pyrope on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AF.05SillimaniteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m)
9.AF.10AndalusiteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.10KanonaiteMn3+Al(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.15KyaniteAl2(SiO4)OTric. 1 : P1
9.AF.20MulliteAl4+2xSi2-2xO10-xOrth. mmm (2/m 2/m 2/m) : Pbam
9.AF.20Krieselite(Al,Ga)2(GeO4)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.AF.23BoromulliteAl9BSi2O19Orth. mm2 : Cmc21
9.AF.25YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)Mon. 2/m : P21/m
9.AF.30MagnesiostauroliteMg(Mg,Li)3(Al,Mg)18Si8O44(OH)4Mon. 2/m : B2/m
9.AF.30StauroliteFe2+2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.30ZincostauroliteZn2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.35TopazAl2(SiO4)(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.40NorbergiteMg3(SiO4)(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.45AlleghanyiteMn2+5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.45Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2Mon. 2/m : P21/b
9.AF.45ReinhardbraunsiteCa5(SiO4)2(OH,F)2Mon. 2/m : P21/b
9.AF.45KumtyubeiteCa5(SiO4)2F2Mon. 2/m : P21/b
9.AF.45HydroxylchondroditeMg5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.50Humite(Mg,Fe2+)7(SiO4)3(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.50Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2Orth.
9.AF.50Unnamed (Ca-analogue of Humite)Ca7(SiO4)4F2Orth. mmm (2/m 2/m 2/m)
9.AF.55ClinohumiteMg9(SiO4)4F2Mon.
9.AF.55SonoliteMn2+9(SiO4)4(OH)2Mon.
9.AF.55HydroxylclinohumiteMg9(SiO4)4(OH)2Mon. 2/m
9.AF.60LeucophoeniciteMn2+7(SiO4)3(OH)2Mon. 2/m : P21/b
9.AF.65Ribbeite(Mn2+,Mg)5(SiO4)2(OH)2Orth.
9.AF.70JerrygibbsiteMn2+9(SiO4)4(OH)2Orth. mmm (2/m 2/m 2/m) : Pbcn
9.AF.75FranciscaniteMn2+6(V5+,☐)2(SiO4)2(O,OH)6Hex.
9.AF.75ÖrebroiteMn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3Hex.
9.AF.75WeliniteMn2+6(W6+,Mg)2(SiO4)2(O,OH)6Trig. 3 : P3
9.AF.85Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85MagnesiochloritoidMgAl2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2Mon.
9.AF.90PoldervaartiteCaCa[SiO3(OH)](OH)Orth. mmm (2/m 2/m 2/m) : Pbca
9.AF.90OlmiiteCaMn2+[SiO3(OH)](OH)Orth. mmm (2/m 2/m 2/m) : Pbca

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.14.1ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2OOrth.
16.14.2VinogradoviteNa4Ti4(Si2O6)2[(Si,Al)4O10]O4 · (H2O,Na,K)3Mon. 2/m : B2/b
16.14.3RhöniteCa2(Mg,Fe2+,Fe3+,Ti)6[O2|(Si,Al)6O18]Tric. 1 : P1
16.14.4Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2 Mon.
16.14.5Ferro-kaersutite{Na}{Ca2}{Fe2+3AlTi}(Al2Si6O22)O2Mon.
16.14.6JonesiteBa4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2 · 6H2OOrth.
16.14.7Lourenswalsite(K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12Hex.
16.14.8Labuntsovite-MnNa4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2OMon.
16.14.9KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3Iso.
16.14.11Carlosturanite(Mg,Fe,Ti)21(Si,Al)12O28(OH)34•H2OMon.
16.14.12EakeriteCa2SnAl2Si6O18(OH)2 · 2H2OMon.
16.14.13PlumalsitePb4Al2(SiO3)7
16.14.14WickenburgiteCaPb3Al2Si10O24(OH)6Trig. 3m : P3 1c
16.14.15MaricopaitePb7Ca2(Si,Al)48O100 · 32H2OOrth.
16.14.16Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
16.14.17BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6Trig. 3m (3 2/m) : P3 1m
16.14.18MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6Trig.

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 EllenbergeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Klaska, R. (1985) Ellenbergit, ein neues Hochdruck-Mg-Al-(Ti,Zr)-Silikat mit flächenverknüpfenden Oktaedern. Zeitschrift für Kristallographie: 170: 93-95.
Chopin, C., Klaska, R., Medenbach, O., Dron, D. (1986) Ellenbergerite, a new high-pressure Mg-Al-(Ti,Zr)-silicate with a novel structure based on face-sharing octahedra. Contributions to Mineralogy and Petrology: 92: 316-321.
Chopin, C. (1986) Phase relationships of ellenbergerite, a new high-pressure Mg-Al-Ti-silicate in pyrope-coesite-quartzite from the Western Alps. Geological Society of America Memoir: 164: 31-42.
Chopin, C. (1986) Petrological, crystal-chemical and spectroscopic study of the ellenbergerite group. Fortschritt der Mineralogie: 65: 36-40.
Chopin, C., Langer, K. (1988) Fe2+-Ti4+ charge transfer between face-sharing octahedra: polarized absorption spectra and crystal chemistry of ellenbergerite. Bulletin de Minéralogie: 111: 17-27.
Baller, T., Chopin, C., Schreyer, W. (1992) Ellenbergerite stability: a rappraisal. Proceedings of the 4th International Symposium of Experimental Mineralogy Petrology Geochemistry, Clermont Ferrand, 15-17 April 1992. Terra Nova, Abstract supplement: 4: 10.
Comodi, P., Zanazzi, P.F. (1993) Structural study of ellenbergerite. Part I: Effects of high temperature. European Journal of Mineralogy: 5: 819-829.
Comodi, P., Zanazzi, P.F. (1993) Structural study of ellenbergerite. Part II: Effects of high pressure. European Journal of Mineralogy: 5: 831-838.

Internet Links for EllenbergeriteHide

Localities for EllenbergeriteHide

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.
Italy
 
  • Piedmont
    • Cuneo Province
[Contr. Mineral. Petrol., 92, 316-321.; MinRec 27:303]
      • Po Valley
        • Martiniana Po
Contr. Mineral. Petrol., 92, 316-321.; MinRec 27:303; Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
Mineral and/or Locality  
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