Mineralogy Database

Zajacite-(Ce) Mineral Data

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General Zajacite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: Na(REExCa1-x)(REEyCa1-y)F6 where (x ne y)
Help on Composition: Composition: Molecular Weight = 295.08 gm
   Sodium            7.79 %  Na   10.50 % Na2O
   Calcium          16.98 %  Ca   23.76 % CaO
   La,Ce,Pr,Nd,Sm,  36.60 %  RE   42.70 % REE2O3
   Fluorine         38.63 %  F    38.63 % F
                      -   %   F   -16.27 % -O=F2    
                   ______        ______ 
                   100.00 %       99.32 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaREE0.5Ca0.5REE0.25Ca0.75F6
Help on Environment: Environment: In a Precambrian perialkaline granitic complex.
Help on IMA Status: IMA Status: Approved IMA 1995
Help on Locality: Locality: The Strange Lake rare-earth-element deposit, about 250 km northeast of Schefferville, Quebec, on the Quebec-Labrador border, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Dr. Ihor Stephan Zajac (1935- ), the geologist who lead the exploration group that discovered the Strange Lake deposit and who first reconized the mineral.
Help on Name Pronunciation: Name Pronunciation: Zajacite-(Ce) Say ZAJACITE-(CE)
Help on Synonym: Synonym: IMA1993-038
 

Zajacite-(Ce) Image

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  Zajacite-(Ce)

Comments: Specimen of granodiorite hosting cream colored phenocrysts of zajacite-Ce. This is one of the few minerals (less than 20) that contain Praseodymium.
Location: Strange Lake, Lac Brasson, Quebec, Canada. Scale: 4.3 x 2.9 cm.
© John Veevaert

Zajacite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.81406
Help on Cell Dimensions: Cell Dimensions: a = 6.099, c = 11.064, Z = 3; V = 356.42 Den(Calc)= 4.12
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: P 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.036(1), 1.757(0.8), 5.29(0.7),
 

Physical Properties of Zajacite-(Ce)

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Pale pink, Orange.
Help on Density: Density: 4.44 - 4.55, Average = 4.49
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Zajacite-(Ce)

Help on Optical Data: Optical Data: Uniaxial (+), w=1.483, e=1.503, bire=0.0200.
 

Calculated Properties of Zajacite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.79 gm/cc
note: Specific Gravity of Zajacite-(Ce) =4.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEZajacite-(Ce) = 227.92 barns/electron
U=PEZajacite-(Ce) x relectron= 863.98 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 36,050.05 (Gamma Ray American Petroleum Institute Units)
Concentration of Zajacite-(Ce) per GRapi unit = 27.74 (PPM)

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

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 843.73 ±210.93 grams of pure Zajacite-(Ce) .

Estimated Radioactivity from Zajacite-(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 / 7.74 cm 822,795 2.22E-05 36,050.05 11.85
100 gm / 3.59 cm 82,280 2.22E-06 3,605.00 1.19
10 gm / 1.67 cm 8,228 2.22E-07 360.50 0.12
1 gm / 7.74 mm 823 2.22E-08 36.05 0.01
0.1 gm / 3.59 mm 82 2.22E-09 3.61 0.00
0.01 gm / 1.67 mm 8 2.22E-10 0.36 0.00
0.001 gm / 0.77 mm 1 2.22E-11 0.04 0.00

Weight of pure Zajacite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.12 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 ( 1.83 % Th) From Sum REE Elements (36.60 % REE)
 

Zajacite-(Ce) Classification

Help on  Dana Class: Dana Class: 11.05.07.01 (11)Halide Complexes; Alumino-fluorides
  (11.05)where (A)m B (X)6
  (11.05.07)Dana Group
 
11.05.07.01 Zajacite-(Ce) Na(REExCa1-x)(REEyCa1-y)F6where(xney) P 3 3
Help on  Strunz Class: Strunz Class: 03.AB.35 03 - HALIDES
  03.A - Simple Halides, Without H2O
  03.AB -M:X = 1:2
 
03.AB.35 Gagarinite-(Y) NaCaY(F,Cl)6 P 3 3
 
03.AB.35 Zajacite-(Ce) Na(REExCa1-x)(REEyCa1-y)F6where(xney) P 3 3
 

Other Zajacite-(Ce) Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.82,p1040,1997) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Zajacite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Print or Cut-and-Paste your Zajacite-(Ce) Specimen Label here :

Zajacite-(Ce)

Na(REExCa1-x)(REEyCa1-y)F6 where (x ne y)
Dana No: 11.05.07.01 Strunz No: 03.AB.35
Locality:

 

Notes:

 

 
   
 


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