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Abenakiite-(Ce)

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Abenaki Couple
Formula:
Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)O
Colour:
Pale brown
Lustre:
Vitreous
Hardness:
4 - 5
Specific Gravity:
3.21
Crystal System:
Trigonal
Name:
Named after the Abenaki, the indigenous people who inhabited the area around Mont Saint-Hilaire in southern Québec, prior to the arrival of European settlers.
Unique chemistry (the only Na-REE-Si-P-C mineral). Chemistry comparable to that of steenstrupine-(Ce).

Currently the only mineral with a supposed sulphur dioxide ligand.
Originally a single grain was found, making the mineral exceedingly rare.

Hexagonal net of the structure contains (1) chains of NaO7 polyhedra connected with phosphate groups, (2) six-membered ring of SiO4, NaO7 and NaO7-(REE)O8 polyhedra, forming columns, (3) carbonate and SO2 groups, and NaO6 octahedra, within the columns. In terms of the linkage of six-member silicate ring and NaO6 octahedron, abenakiite-(Ce) may be compared to kazakovite and steenstrupine-(Ce) (McDonald et al., 1994).

Infrared data for an S-deficient and H2O-bearing variety or a related species from the Sirenevaya pegmatite is given by Chukanov (2014). The mineral occurs as a yellow-grey grain in ussingite, and its empirical formula is reported as (Na5.55K0.17Ca0.04)(Ce3.34La1.71Nd1.20Pr0.46Th0.12)(Si5.97P6.86S0.17)Ox(CO3)y.nH2O. This formula doesn't seem to correspond to abenakiite-(Ce) and no XRD data is given to confirm its identity with abenakiite-(Ce). The main IR bands obtained for this material are [cm-1]: 3390, 1580sh, 1520, 1140sh, 1070s, 902, 860sh, 615, and 448.


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Classification of Abenakiite-(Ce)Hide

Approved
Approval Year:
1991
9.CK.10

9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
Dana 7th ed.:
61.4.1.1
61.4.1.1

61 : CYCLOSILICATES Six-Membered Rings
4 : Six-Membered Rings with other anions

Physical Properties of Abenakiite-(Ce)Hide

Vitreous
Colour:
Pale brown
Streak:
White
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
{0001}
Fracture:
Conchoidal
Density:
3.21 g/cm3 (Measured)    3.27 g/cm3 (Calculated)

Optical Data of Abenakiite-(Ce)Hide

Type:
Uniaxial (-)
RI values:
nω = 1.589() nε = 1.586(1)
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Non-pleochroic

Chemical Properties of Abenakiite-(Ce)Hide

Formula:
Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)O
IMA Formula:
Na26Ce6(SiO3)6(PO4)6(CO3)6(SO2)O

Chemical AnalysisHide

Oxide wt%:
 12345
Na2O25.04 %25.33 %25.52 %25.37 %25.32 %
Ce2O315.50 %15.36 %15.24 %15.15 %15.31 %
La2O36.08 %5.86 %6.11 %5.69 %5.94 %
Nd2O38.04 %8.07 %7.59 %7.41 %7.78 %
Pr2O31.91 %2.43 %1.95 %1.77 %2.02 %
Sm2O30.88 %0.78 %0.59 %0.70 %0.74 %
ThO21.86 %1.27 %1.21 %1.32 %1.42 %
SrO0.12 %0.13 %0.09 %0.13 %0.12 %
SiO213.71 %13.35 %13.00 %13.14 %13.30 %
P2O514.60 %14.09 %13.70 %14.05 %14.11 %
SO22.34 %2.34 %2.18 %2.28 %2.28 %
CO29.10 %8.95 %8.76 %8.82 %8.91 %
Total:99.18 %97.96 %95.94 %95.83 %97.25 %
Empirical formulas:
Sample IDEmpirical Formula
5 Na24.23(Ce2.77Nd1.37La1.08Pr0.36Th0.16Sm0.13Sr0.03)Σ5.90Si6.56P5.90C6S1.06O63
Sample references:
IDTypeLocalityReference
1Type SpecimenPoudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, CanadaMcDonald, A. M., Chao, G. Y., & Grice, J. D. (1994). Abenakiite-(Ce), a new silicophosphate carbonate mineral from Mont Saint-Hilaire, Quebec; description and structure determination. The Canadian Mineralogist, 32(4), 843-854.
2Type Specimen  "  "  "  "
3Type Specimen  "  "  "  "
4Type Specimen  "  "  "  "
5Average of analyses 1-4  "  "  "  "

Crystallography of Abenakiite-(Ce)Hide

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 16.018(2) Å, c = 19.761(2) Å
Ratio:
a:c = 1 : 1.234
Unit Cell V:
4,390.93 ų (Calculated from Unit Cell)
Z:
3

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.414(75)
8.036(85)
6.554(85)
4.646(75)
3.773(90)
3.591(80)
3.150(70)
2.674(100)

Type Occurrence of Abenakiite-(Ce)Hide

General Appearance of Type Material:
a single grain 2x1 mm
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa Ontario (#81501)
Geological Setting of Type Material:
In a xenolith of Sodalite syenite. A late-stage phase, possibly arising from a metasomatic event associated with emplacement of the nepheline syenite
Associated Minerals at Type Locality:
Reference:
McDonald, A. M., Chao, G. Y., & Grice, J. D. (1994). Abenakiite-(Ce), a new silicophosphate carbonate mineral from Mont Saint-Hilaire, Quebec; description and structure determination. The Canadian Mineralogist, 32(4), 843-854.

Synonyms of Abenakiite-(Ce)Hide

Other Language Names for Abenakiite-(Ce)Hide

Related Minerals - Nickel-Strunz GroupingHide

9.CK.Fluor-schorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.DarrellhenryiteNa(LiAl2)Al6(BO3)3Si6O18(OH)3O Trig. 3m : R3m
9.CK.AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
9.CK.05Chromium-draviteNa(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig.
9.CK.05DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig.
9.CK.05Foitite(□,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OHTrig. 3m : R3m
9.CK.05LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)Trig.
9.CK.05PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig.
9.CK.05SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Magnesio-foitite(□,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig.
9.CK.05Rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Oxy-vanadium-draviteNa(V)3(V4Mg2)Si6O18(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Oxy-draviteNa(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Oxy-rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3O
9.CK.05Chromo-alumino-povondraiteNa(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-draviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Fluor-uviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.15ScawtiteCa7(Si3O9)2CO3 · 2H2OMon. 2/m
9.CK.20Steenstrupine-(Ce)Na14Mn2+2(Fe3+,Mn3+)2Ce6(Zr,Th)(Si6O18)2(PO4)6(HPO4)(OH)2 · 2H2OTrig.
9.CK.20Thorosteenstrupine(Ca,Th,Mn)3Si4O11F · 6H2O

Fluorescence of Abenakiite-(Ce)Hide

Other InformationHide

Notes:
a very weak effervescence in l:1 HCl
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 Abenakiite-(Ce)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
McDonald, A.M., Chao, G.Y., Grice, J.D. (1994): Abenakiite (Ce), a new silicophosphate carbonate mineral from Mont Saint Hilaire, Quebec: description and structure determination. The Canadian Mineralogist: 32: 843-854.
Chukanov, N.V. (2014): Infrared spectra of mineral species: Extended library. Springer (Springer Geochemistry/Mineralogy), vol. 1, Dordrecht, 1726 pp.

Internet Links for Abenakiite-(Ce)Hide

Localities for Abenakiite-(Ce)Hide

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

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada (TL)
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
McDonald, A.M., Chao, G.Y. and Grice, J.D. (1994), Abenakiite-(Ce), a new silicophosphate carbonate mineral from Mont Saint-Hilaire, Quebec: Description and structure determination. Canadian Mineralogist, 32, 843-854.
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Lovozero Massif
          • Alluaiv Mt
            • Umbozero mine (Umbozerskii mine; Umba Mine)
Chukanov, N.V. (2014): Infrared spectra of mineral species: Extended library. Springer (Springer Geochemistry/Mineralogy), vol. 1, Dordrecht,1726 pp.
Mineral and/or Locality  
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