Lukechangite-(Ce) Mineral Data

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General Lukechangite-(Ce) Information

Chemical Formula:

Na3Ce2(CO3)4F

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

Empirical Formula:

Na₃Ce₂(CO₃)₄F

Environment:

In a large pegmatite dike in nepheline syenite.

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Prof. Luke L. Y. Chang (1934-) University of Maryland, for his contributions to the study of carbonate group minerals.

Name Pronunciation:

Lukechangite-(Ce) + Pronunciation

Synonym:

ICSD 83767

IMA1996-033

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Lukechangite-(Ce) Crystallography

Axial Ratios:

a:c = 1:4.51262

Cell Dimensions:

a = 5.068, c = 22.87, Z = 2; V = 508.71 Den(Calc)= 3.97

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/I_o): 4.31(1), 2.192(0.9), 3.169(0.7),

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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)

Cleavage:

{001} Perfect

Color:

Colorless, Beige tan.

Density:

3.97

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Lukechangite-(Ce)

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

Optical Data:

Uniaxial (-), e=1.542, w=1.728, bire=0.1860.

Calculated Properties of Lukechangite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.63 gm/cc
note: Specific Gravity of Lukechangite-(Ce) =3.97 gm/cc.

Fermion Index:

Fermion Index = 0.0010203968
Boson Index = 0.9989796032

Photoelectric:

PE_{Lukechangite-(Ce)}= 233.00 barns/electron
U=PE_{Lukechangite-(Ce)} x r_electron= 845.58 barns/cc.

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 Bequerols (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

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

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

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.82,p1255-1260,1997) OPTIC PROP.(MinRec)

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - MinMax(Deutsch)
10 - MinMax(English)
11 - Mineralienatlas (Deutsch)
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: