Zajacite-(Ce) Mineral Data + Say ZAJACITE-(CE)


[Newest Minerals] [Minerals for Sale] [Educational Articles] [About Us] [Image Gallery]
John Betts - Fine Minerals
Classic minerals, out-of-print books & magazines, plus informative articles for collectors

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 Synonym: Synonym: IMA1993-038
 

Zajacite-(Ce) Image

Click Here for Larger Zajacite-(Ce) Image in a New Browser Window Images:
Click Here for Larger Zajacite-(Ce) Image

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 - RhombohedralH-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 Diaphaniety: Diaphaniety: 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 Gladstone-Dale: Gladstone-Dale: CI meas= 0.237 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.167 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1197,KPDmeas= 0.1097,KC= 0.1437
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:

relectron=3.79 gm/cc
note: rZajacite-(Ce) =4.12 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.06832
Boson Index = 0.93168
Help on Photoelectric: Photoelectric:

PEZajacite-(Ce) = 227.92 barns/electron
U=PEZajacite-(Ce) x relectron= 863.98 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 36,050.04 (Gamma Ray American Petroleum Institute Units)

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 36,050.04 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: 11.5.7.1 (11)Halide Complexes; Alumino-fluorides
  (11.5)where (A)m B (X)6
  (11.5.7)Dana Group
 
11.5.7.1 Zajacite-(Ce) Na(REExCa1-x)(REEyCa1-y)F6where(xney) P 3 3
Help on Strunz Class: Strunz Class: III/A.08-45 III - Halogenides
  III/A - Simple Halogenides, without water Metal : Halogen = 1 : 2, 1 : 3
  III/A.08 - Fluorite series and related compounds
 
III/A.08-10 Fluorite CaF2 F m3m 4/m 3 2/m
 
III/A.08-20 Frankdicksonite BaF2 F m3m 4/m 3 2/m
 
III/A.08-25 Haleniusite-(La)! (La,Ce)OF F m3m 4/m 3 2/m
 
III/A.08-30 Tveitite-(Y) Ca1-xYxF2x,x~0.3 Unk Mono
 
III/A.08-40 Gagarinite-(Y) NaCaY(F,Cl)6 P 3 3
 
III/A.08-45 Zajacite-(Ce) Na(REExCa1-x)(REEyCa1-y)F6where(xney) P 3 3
 
III/A.08-50 Laurelite Pb7F12Cl2 P 6 6
 
III/A.08-60 Coccinite* HgI2(?) P 41/nmc 4/m 2/m 2/m
 

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

Search for Zajacite-(Ce) using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Zajacite-(Ce) :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Zajacite-(Ce) Mineral Data :

Ask about Zajacite-(Ce) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: 11.5.7.1 Strunz No: III/A.08-45
Locality:

 

Notes:

 
 
   
 
Go To Webmineral Home Crystallography X-Ray D-Spacing Table Chemical Composition
Dana Classification Strunz Classification Table of Mineral Properties Alphabetical Listing of Minerals
Search Webmineral Photo Gallery of Mineral Images Help Files Links