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Abenakiite-(Ce)

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Abenaki Couple
Formula:
Na26Ce6(SiO3)6(PO4)6(CO3)6(SO2)O
System:
Trigonal
Colour:
Pale brown
Lustre:
Vitreous
Hardness:
4 - 5
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 coompable to that of steenstrupine-(Ce).

Currently the only mineral with supposed sulfur dioxide ligand.

Originally a single grain was found, making the mineral exceedingly rare. UK85

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.


Classification of Abenakiite-(Ce)

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

Type Occurrence of Abenakiite-(Ce)

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

Physical Properties of Abenakiite-(Ce)

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

Crystallography of Abenakiite-(Ce)

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 Volume:
V 4,390.93 ų (Calculated from Unit Cell)
Z:
3
X-Ray 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)

Optical Data of Abenakiite-(Ce)

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)

Formula:
Na26Ce6(SiO3)6(PO4)6(CO3)6(SO2)O
Elements listed in formula:

Relationship of Abenakiite-(Ce) to other Species

9.CK.Fluor-schorlNaFe32+Al6(Si6O18)(BO3)3(OH)3F
9.CK.05Fluor-buergeriteNaFe33+Al6(Si6O18)(BO3)3O3F
9.CK.05Chromium-draviteNa(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
9.CK.05DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3OH
9.CK.05ElbaiteNa(Al1.5Li1.5)Al6(Si6O18)(BO3)3(OH)3OH
9.CK.05FeruviteCaFe32+(Al5Mg)(Si6O18)(BO3)3(OH)3OH
9.CK.05Foitite◻(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3OH
9.CK.05LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
9.CK.05OleniteNaAl3Al6(Si6O18)(BO3)3(O3)OH
9.CK.05PovondraiteNaFe33+(Fe43+Mg2)(Si6O18)(BO3)3(OH)3O
9.CK.05SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3OH
9.CK.05Magnesio-foitite◻(Mg2Al)Al6(Si6O18)(BO3)3(OH)3OH
9.CK.05Rossmanite◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3OH
9.CK.05Oxy-vanadium-draviteNa(V)3(V4Mg2)Si6O18(BO3)3(OH)3O
9.CK.05Oxy-draviteNa(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O
9.CK.05Oxy-rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3O
9.CK.05Chromo-alumino-povondraiteNaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3O
9.CK.05Fluor-draviteNaMg3Al6(Si6O18)(BO3)3(OH)3F
9.CK.05Fluor-uviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3F
9.CK.15ScawtiteCa7(Si3O9)2(CO3) · 2H2O
9.CK.20Steenstrupine-(Ce)Na14Ce6Mn22+Fe23+Zr(PO4)7Si12O36(OH)2 · 3H2O
9.CK.20Thorosteenstrupine(Ca,Th,Mn)3Si4O11F · 6H2O

Other Names for Abenakiite-(Ce)

Name in Other Languages:

Other Information

Other Information:
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)

Reference List:
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)

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http://www.mindat.org/min-2.html
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Localities for Abenakiite-(Ce)

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.
(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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