Lukechangite-(Ce) Mineral Data +

Fabre Minerals

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:	For Prof. Luke L. Y. Chang (1934-) University of Maryland, for his contributions to the study of carbonate group minerals.
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
X Ray Diffraction:	By Intensity(I/Io): 4.31(1), 2.192(0.9), 3.169(0.7),
Forms: Mouse Dbl Clk - Start-Stop Rotation RMB - Cycle Display Modes Drag1 - Manipulate Crystal Drag2 - Resize Keyboard S - Stereo I - Indicies <space> - Start-Stop Rotation F - Fit to Screen M - Menu Help on Above	Forms: [ 1 0 1] [ 0 1 0] [ 0 0 1] Warning: this large pop-up is very compute intensive and may not work well with some computers.
Crystal Structure: Mouse drag1 - LMB Manipulate Structure drag2 - RMB Resize/Rotate Keyboard S - Stereo Pair on/off H - Help Screen I - Data Info A - Atoms On/Off P - Polyhedra On/Off B - Bonds On/Off Help on Above	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
Diaphaniety:	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
Optical Data:	Uniaxial (-), e=1.542, w=1.728, bire=0.1860.
Calculated Properties of Lukechangite-(Ce)
Electron Density:	relectron=3.63 gm/cc note: rLukechangite-(Ce) =3.97 gm/cc.
Fermion Index	Fermion Index = 0.00102 Boson Index = 0.99898
Photoelectric:	PELukechangite-(Ce) = 233.00 barns/electron U=PELukechangite-(Ce) x relectron= 845.58 barns/cc.
Radioactivity:	GRapi = 44,923.73 (Gamma Ray American Petroleum Institute Units) 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 44,923.73 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.1.7.2 (16a)Carbonates - Hydroxyl or Halogen
	(16a.1)in the Bastnasite/Shynchysite/Parasite Groups
	(16a.1.7)Dana Group
	16a.1.7.1 Cordylite-(Ce) Ba(Ce,La)2(CO3)3F2 P 63/mmc 6/m 2/m 2/m
	16a.1.7.2 Lukechangite-(Ce) ! Na3Ce2(CO3)4F P 63/mmc 6/m 2/m 2/m
Strunz Class:	V/C.07-175 V - Nitrates, Carbonates and Borates
	V/C - Waterfree carbonates with unfamiliar anions
	V/C.07 - Bastnäsite-(Y) - Mineevite-(Y) series
	V/C.07-10 Bastnasite-(Y) Y(CO3)F P 62c 6 m2
	V/C.07-20 Bastnasite-(La) La(CO3)F P 62c 6 m2
	V/C.07-30 Bastnasite-(Ce) Ce(CO3)F P 62c 6 m2
	V/C.07-40 Hydroxylbastnasite-(La) La(CO3)(OH) C 2221 2 2 2
	V/C.07-50 Hydroxylbastnasite-(Ce) Ce(CO3)(OH) P 62c 6 m2
	V/C.07-60 Hydroxylbastnasite-(Nd) Nd(CO3)(OH) P 62c 6 m2
	V/C.07-61 Kozoite-(Nd)! (Nd,La,Sm,Pr)(CO3)(OH) Pmcn 2/m 2/m 2/m
	V/C.07-62 Kozoite-(La)! La(CO3)(OH) Pmcn 2/m 2/m 2/m
	V/C.07-64 Horvathite-(Y)! NaY(CO3)F2 Pmcn 2/m 2/m 2/m
	V/C.07-70 Parisite-(Ce) Ca(Ce,La)2(CO3)3F2 R 3 3
	V/C.07-80 Parisite-(Nd) Ca(Nd,Ce,La)2(CO3)3F2 R 3 3
	V/C.07-90 Rontgenite-(Ce) Ca2(Ce,La)3(CO3)5F3 R 3 3
	V/C.07-100 Synchysite-(Y) CaY(CO3)2F C 2/c 2/m
	V/C.07-110 Synchysite-(Ce) CaCe(CO3)2F C 2/c 2/m
	V/C.07-120 Synchysite-(Nd) CaNd(CO3)2F Unk Ortho
	V/C.07-130 Huanghoite-(Ce) BaCe(CO3)2F R 3m 3 2/m
	V/C.07-140 Cebaite-(Ce) Ba3Ce2(CO3)5F2 C 2/m or C 2 Mono
	V/C.07-150 Cebaite-(Nd)! Ba3(Nd,Ce)2(CO3)5F2 Unk Mono
	V/C.07-154 Kukharenkoite-(La)! Ba2(La,Ce)(CO3)3F P 21/m 2/m
	V/C.07-155 Kukharenkoite-(Ce)! Ba2Ce(CO3)3F P 21/m 2/m
	V/C.07-160 Zhonghuacerite-(Ce) Ba2Ce(CO3)3F P 21/m 2/m
	V/C.07-170 Cordylite-(Ce) Ba(Ce,La)2(CO3)3F2 P 63/mmc 6/m 2/m 2/m
	V/C.07-175 Lukechangite-(Ce) Na3Ce2(CO3)4F P 63/mmc 6/m 2/m 2/m
	V/C.07-190 Mineevite-(Y) Na25Ba(Y,Gd,Dy)2(HCO3)4(CO3)11(SO4)2ClF2 P 63/m 6/m
	V/C.07-200 Reederite-(Y)! Na15Y2(CO3)9(SO3F)Cl P 6 6
	V/C.07-210 Micheelsenite! (Ca,Y)3Al[PO3OH,CO3](CO3)(OH)6·12(H2O) P 63 6
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 - WWW-MINCRYST Search for Lukechangite-(Ce) using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Lukechangite-(Ce) : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Lukechangite-(Ce) Mineral Data : Ask about Lukechangite-(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 Lukechangite-(Ce) Specimen Label here : Lukechangite-(Ce) Na3Ce2(CO3)4F Dana No: 16a.1.7.2 Strunz No: V/C.07-175 Locality:   Notes: