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Andrémeyerite

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Formula:
BaFe2+2(Si2O7)
Colour:
light emerald-green
Hardness:
Crystal System:
Monoclinic
Name:
To honor André Marie Meyer (Turku, Finland, October 13 1920 - Libreville, Gabon, January 10 1965), Belgian geologist with the Geological Survey of the Belgian Congo, who first collected the mineral. His publications were essentially devoted to igneous rocks from Kivu, in particular to lava flows of the Nyiragongo and Nyamuragira volcanoes, as well to the rocks forming the syenite-carbonatite complex of the Lueshe (Der Meersche et al. 2010).

This page provides mineralogical data about Andrémeyerite.


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Classification of AndrémeyeriteHide

Approved
Approval Year:
1972
9.BB.20

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
56.2.6c.6

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
14.7.8

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn

Physical Properties of AndrémeyeriteHide

Transparency:
Transparent, Translucent
Colour:
light emerald-green
Hardness:
5½ on Mohs scale
Cleavage:
Perfect
Perfect on {100} and {010}

Optical Data of AndrémeyeriteHide

Type:
Biaxial (+)
RI values:
nα = 1.740 nβ = 1.740 nγ = 1.760
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v moderate

Chemical Properties of AndrémeyeriteHide

Formula:
BaFe2+2(Si2O7)
Common Impurities:
Al,Mn,Mg,Ca,Na,K

Crystallography of AndrémeyeriteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 7.48 Å, b = 13.78 Å, c = 7.08 Å
β = 118.23°
Ratio:
a:b:c = 0.543 : 1 : 0.514
Unit Cell V:
642.97 ų (Calculated from Unit Cell)
Morphology:
As crystals, < 0.2 mm, with {100} and {010} dominant, also {011} and {120}.
Twinning:
Multiple twinning on {100}.

Type Occurrence of AndrémeyeriteHide

Place of Conservation of Type Material:
University of Helsinki, Helsinki, Finland.
Canillo (1988) examined the crystal structure using matarial provided by Thure Sahama: this could explain the absence of any holotype material in the present-day collection in Helsinki.
Geological Setting of Type Material:
In vesicles of melilite-leucite-nephelinite; may represent crystallization of an associated green glass.
Associated Minerals at Type Locality:

Synonyms of AndrémeyeriteHide

Other Language Names for AndrémeyeriteHide

Related Minerals - Nickel-Strunz GroupingHide

9.BB.10ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
9.BB.10CebolliteCa5Al2(SiO4)3(OH)4Orth.
9.BB.10GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
9.BB.10GugiaiteCa2Be(Si2O7)Tet.
9.BB.10HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
9.BB.10Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)Orth.
9.BB.10OkayamaliteCa2B(BSiO7)Tet.
9.BB.10Alumoåkermanite(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)Tet. 4 2m : P4 21m
9.BB.15BaryliteBe2Ba(Si2O7)Orth.
9.BB.15Barylite-1OBe2Ba(Si2O7)Mon. m : Pm

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

56.2.6c.1Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)Mon.
56.2.6c.2Delindeite(Na,K)2(Ba,Ca)2(Ti,Fe,Al)3(Si2O7)2O2(OH)2 · 2H2OMon.
56.2.6c.3EricssoniteBaMn2+2Fe3+(Si2O7)O(OH)Mon. 2/m : B2/m
56.2.6c.4Lamprophyllite(Na,Mn2+)3(Sr,Na)2(Ti,Fe3+)3(Si2O7)2O2(OH,O,F)2Mon.
56.2.6c.5Ericssonite-2OBaMn2+2Fe3+(Si2O7)O(OH)Orth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.7.1SanborniteBa2(Si4O10)Orth.
14.7.2KrauskopfiteBaSi2O5 · 3H2OMon.
14.7.3WalstromiteBaCa2(Si3O9)Tric.
14.7.4MacdonalditeBaCa4Si16O36(OH)2 · 10H2OOrth.
14.7.5EricssoniteBaMn2+2Fe3+(Si2O7)O(OH)Mon. 2/m : B2/m
14.7.6Ericssonite-2OBaMn2+2Fe3+(Si2O7)O(OH)Orth.
14.7.7GillespiteBaFe2+Si4O10Tet.
14.7.9PellyiteBa2Ca(Fe,Mg)2Si6O17Orth.
14.7.10TaikaniteSr3BaMn2+2(Si4O12)O2Mon.
14.7.11WillemiteZn2SiO4Trig. 3 : R3
14.7.12HemimorphiteZn4Si2O7(OH)2 · H2OOrth. mm2 : Imm2
14.7.13ZincsiliteZn3(Si4O10)(OH)2 · 4H2OMon.
14.7.14HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
14.7.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6Mon.
14.7.16ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
14.7.17JunitoiteCaZn2Si2O7 · H2OOrth. mm2
14.7.18LarsenitePbZnSiO4Orth. mm2 : Pna21
14.7.19EsperitePbCa2Zn3(SiO4)3Mon. 2/m : P21/b
14.7.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2Mon.
14.7.21GerstmanniteMnMgZn(SiO4)(OH)2Orth.
14.7.22GageiteMn21(Si4O12)2O3(OH)20Mon. 2/m
14.7.23FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8Mon. 2 : B2

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 AndrémeyeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sahama, T.G., Siivola, J., Rehtijärvi, P. (1973) Andremeyerite, a new barium iron silicate from Nyiragongo, Zaire. Bulletin of the Geological Society of Finland: 45: 1-8.
Fleischer, M., Mandarino, J.A. (1974) New mineral names. American Mineralogist: 59: 381-384. [abstract of Sahama et al. 1973]
Maier, P., Keesmann, I. (1987) Experimentelle Untersuchungen zur Archäometallurgie: Andremeyerit - Synthese und Phasenbeziehungen im System BaO-FeO-SiO2. Fortschritte der Mineralogie: 65: Supplement 1: 126-126.
Cannillo, E.C., Mazzi, F., Rossi, G. (1988) Crystal structure of andremeyerite, BaFe(Fe;Mn;Mg)Si2O7. American Mineralogist: 73: 608-612.
Van Der Meersche, E.V., De Paepe, P. Stoops, G. (2010) Minerals with Belgian roots, from hopeite (1824) to tazieffite (2009). Academia Press, Gent.

Internet Links for AndrémeyeriteHide

Localities for AndrémeyeriteHide

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.
Austria
 
  • Carinthia
    • Friesach - Hüttenberg area
      • Hüttenberg
        • Waitschach
Kolitsch, U., Brandstätter, F., Schreiber, F., Fink, R. & Auer, C. (2013): Die Mineralogie der weltweit einzigartigen Schlacken von Waitschach, Kärnten. Annalen des Naturhistorischen Museums in Wien, Serie A, 115, 19-87 (in German).
Democratic Republic of the Congo (TL)
 
  • Nord-Kivu
    • Goma
Sahama, T.G., Siivola, J. and P. Rehtijärvi, P. (1973): Andremeyerite, a new barium iron silicate from Nyiragongo, Zaire. Bull. Geol. Soc. Finland, 45, 1-8.; Andersen, T., Elburg, M. A., & Erambert, M. (2014). Extreme peralkalinity in delhayelite-and andremeyerite-bearing nephelinite from Nyiragongo volcano, East African Rift. Lithos, 206, 164-178.
Mineral and/or Locality  
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