Abenakiite-(Ce) Mineral Data + Say ABENAKIITE-(CE)

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General Abenakiite-(Ce) Information
Help on Chemical Formula: Chemical Formula: Na26REE6(SiO3)6(PO4)6(CO3)6(S++++O2)O
Help on Composition: Composition: Molecular Weight = 2,928.18 gm
   Sodium           20.41 %  Na   27.52 % Na2O
   La,Ce,Pr,Nd,Sm,  29.51 %  RE   34.42 % REE2O3
   Silicon           5.75 %  Si   12.31 % SiO2
   Phosphorus        6.35 %  P    14.54 % P2O5
   Carbon            2.46 %  C     9.02 % CO2
   Sulfur            1.10 %  S     2.19 % SO2
   Oxygen           34.42 %  O
                   ______        ______ 
                   100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na26REE6(SiO3)6(PO4)6(CO3)6(SO2)O
Help on Environment: Environment: A single crystal embedded in sodalite in a xenolith of sodalite syenite.
Help on IMA Status: IMA Status: Approved IMA 1994
Help on Locality: Locality: Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the Abenaki Indian tribe, which inhabited the area around Mont Saint-Hilaire.
Help on Synonym: Synonym: ICSD 79159
  IMA1991-054
  PDF 47-1858
 

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Abenakiite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.23367
Help on Cell Dimensions: Cell Dimensions: a = 16.018, c = 19.761, Z = 3; V = 4,390.93 Den(Calc)= 3.32
Help on Crystal System: Crystal System: Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.674(1), 3.773(0.9), 8.036(0.85),
Click Here for Large Abenakiite-(Ce) Structure Window Crystal Structure:

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McDonald A M , Chao G Y , Grice J D , The Canadian Mineralogist , 32 (1994) p.843-854, Abenakiite-(Ce), a new silicophosphate carbonate mineral from Mont, Saint-Hilaire, Quebec: description and structure determination, Locality: Mont Saint-Hilaire, Quebec, Canada

 

Physical Properties of Abenakiite-(Ce)

Help on Cleavage: Cleavage: [0001] Poor
Help on Color: Color: Pale brown.
Help on Density: Density: 3.21
Help on Diaphaniety: Diaphaniety: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Abenakiite-(Ce)

Help on Dichroism (e): Dichroism (e): None.
Help on Dichroism (w): Dichroism (w): None.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.177,KPDmeas= 0.183,KC= 0.1741
Help on Optical Data: Optical Data: Uniaxial (-), e=1.586, w=1.589, bire=0.0030.
 

Calculated Properties of Abenakiite-(Ce)

Help on Electron Density: Electron Density:

relectron=3.13 gm/cc
note: rAbenakiite-(Ce) =3.32 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.0581
Boson Index = 0.9419
Help on Photoelectric: Photoelectric:

PEAbenakiite-(Ce) = 178.05 barns/electron
U=PEAbenakiite-(Ce) x relectron= 557.99 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 29,815.32 (Gamma Ray American Petroleum Institute Units)

Abenakiite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Abenakiite-(Ce) - weak
Specimen
Size
Weight/Volume
(Sphere) *		 Calculated
Activity
Bequerols
(Bq)		 Calculated
Activity
Curies (Ci)		 Estimated
Activity
GR(api)		 Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 8.32 cm 663,314 1.79E-05 29,815.32 9.80
100 gm / 3.86 cm 66,331 1.79E-06 2,981.53 0.98
10 gm / 1.79 cm 6,633 1.79E-07 298.15 0.10
1 gm / 8.32 mm 663 1.79E-08 29.82 0.01
0.1 gm / 3.86 mm 66 1.79E-09 2.98 0.00
0.01 gm / 1.79 mm 7 1.79E-10 0.30 0.00
0.001 gm / 0.83 mm 1 1.79E-11 0.03 0.00

Weight of pure Abenakiite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.32 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 1.48 % Th) From Sum REE Elements (29.51 % REE)
 

Abenakiite-(Ce) Classification
Help on Dana Class: Dana Class: 61.4.1.1 (61)Cyclosilicate Six-Membered Rings
  (61.4)with other anions
  (61.4.1)Dana Group
 
61.4.1.1 Abenakiite-(Ce) Na26REE6(SiO3)6(PO4)6(CO3)6(SO2)O R 3m 3 2/m
Help on Strunz Class: Strunz Class: VIII/E.17-05 VIII - Silicates
  VIII/E - Cyklosilicates, six rings [Si6O18]12-
  VIII/E.17 - Steenstrupine-(Ce) series
 
VIII/E.17-05 Abenakiite-(Ce) Na26REE6(SiO3)6(PO4)6(CO3)6(SO2)O R 3m 3 2/m
 
VIII/E.17-10 Steenstrupine-(Ce) Na14Ce6MnMnFe2(Zr,Th)(Si6O18)2(PO4)7·3(H2O) R 3m 3 2/m
 

Other Abenakiite-(Ce) Information
Help on References: References: NAME( MinRec) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Abenakiite-(Ce) :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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Abenakiite-(Ce)

Na26REE6(SiO3)6(PO4)6(CO3)6(S++++O2)O
Dana No: 61.4.1.1 Strunz No: VIII/E.17-05
Locality:

 

Notes:

 
 
   
 
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