Lukechangite-(Ce) Mineral Data

Lukechangite-(Ce) Mineral Data
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General Lukechangite-(Ce) Information

Help on Chemical Formula: Chemical Formula: Na3Ce2(CO3)4F
Help on Composition: Composition: Molecular Weight = 608.23 gm
   Sodium    11.34 %  Na   15.28 % Na2O
   Cerium    46.07 %  Ce   53.96 % Ce2O3
   Carbon     7.90 %  C    28.94 % CO2
   Oxygen    31.57 %  O
   Fluorine   3.12 %  F     3.12 % F
               -   %   F    -1.32 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na3Ce2(CO3)4F
Help on Environment: Environment: In a large pegmatite dike in nepheline syenite.
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
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: Named for Prof. Luke L. Y. Chang (1934-) University of Maryland, for his contributions to the study of carbonate group minerals.
Help on Name Pronunciation: Name Pronunciation: Lukechangite-(Ce) + Pronunciation Say LUKECHANGITE-(CE)
Help on Synonym: Synonym: ICSD 83767
  IMA1996-033
 

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Lukechangite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:4.51262
Help on Cell Dimensions: Cell Dimensions: a = 5.068, c = 22.87, Z = 2; V = 508.71 Den(Calc)= 3.97
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.31(1), 2.192(0.9), 3.169(0.7),
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Forms: ( 1 0 1) ( 0 1 0) ( 0 0 1)

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Grice J D , Chao G Y , American Mineralogist , 82 (1997) p.1255-1260, Lukechangite-(Ce), a new rare-earth-fluorocarbonate mineral from, Mont Saint-Hilaire, Quebec, Note: U(1,2) for Na1, O1, O2 and F changed to match symmetry constraints., Note: U(2,3) for O2 changed to match symmetry constraints.

 

Physical Properties of Lukechangite-(Ce)

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Colorless, Beige tan.
Help on Density: Density: 3.97
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Lukechangite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1599,KPDmeas= 0.1599,KC= 0.1693
Ncalc = 1.67
Help on Optical Data: Optical Data: Uniaxial (-), e=1.542, w=1.728, bire=0.1860.
 

Calculated Properties of Lukechangite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.63 gm/cc
note: Specific Gravity of Lukechangite-(Ce) =3.97 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0010203968
Boson Index = 0.9989796032
Help on Photoelectric: Photoelectric: PELukechangite-(Ce) = 233.00 barns/electron
U=PELukechangite-(Ce) x relectron= 845.58 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 44,923.74 (Gamma Ray American Petroleum Institute Units)
Concentration of Lukechangite-(Ce) per GRapi unit = 22.26 (PPM)

Lukechangite-(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) 677.07 ±169.27 grams of pure Lukechangite-(Ce) .

Estimated Radioactivity from Lukechangite-(Ce) - weak
Specimen
Size
Weight/Volume
(Sphere) *		 Calculated
Activity
Becquerels
(Bq)		 Calculated
Activity
Curies (Ci)		 Estimated
Activity
GR(api)		 Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 7.84 cm 1,032,028 2.79E-05 44,923.74 14.77
100 gm / 3.64 cm 103,203 2.79E-06 4,492.37 1.48
10 gm / 1.69 cm 10,320 2.79E-07 449.24 0.15
1 gm / 7.84 mm 1,032 2.79E-08 44.92 0.01
0.1 gm / 3.64 mm 103 2.79E-09 4.49 0.00
0.01 gm / 1.69 mm 10 2.79E-10 0.45 0.00
0.001 gm / 0.78 mm 1 2.79E-11 0.04 0.00

Weight of pure Lukechangite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.97 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 ( 2.30 % Th) From Sum REE Elements (46.07 % REE)
 

Lukechangite-(Ce) Classification
Help on Dana Class: Dana Class: 16a.01.07.02 (16a)Carbonates - Hydroxyl or Halogen
  (16a.01)in the Bastnasite/Shynchysite/Parasite Groups
  (16a.01.07)Dana Group
 
16a.01.07.01 Cordylite-(Ce) Ba(Ce,La)2(CO3)3F2 P 63/mmc 6/m 2/m 2/m
 
16a.01.07.02 Lukechangite-(Ce)! Na3Ce2(CO3)4F P 63/mmc 6/m 2/m 2/m
 
16a.01.07.03 IMA2009-013 NaCe2(CO3)2[(CO3)1-xF2x]F P 6 m2 6 m2
Help on Strunz Class: Strunz Class: 05.BD.05 05 - CARBONATES (NITRATES)
  05.B - Carbonates with additional anions, without H2O
  05.BD -With rare-earth elements (REE)
 
05.BD.05 Cordylite-(Ce) Ba(Ce,La)2(CO3)3F2 P 63/mmc 6/m 2/m 2/m
 
05.BD.05 Lukechangite-(Ce)! Na3Ce2(CO3)4F P 63/mmc 6/m 2/m 2/m
 

Other Lukechangite-(Ce) Information
Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.82,p1255-1260,1997) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Lukechangite-(Ce) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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

Lukechangite-(Ce)

Na3Ce2(CO3)4F
Dana No: 16a.01.07.02 Strunz No: 05.BD.05
Locality:

 

Notes: