Cordylite-(Ce) Mineral Data

General Cordylite-(Ce) Information

Chemical Formula:

Ba(Ce,La)2(CO3)3F2

Composition:

Molecular Weight = 634.98 gm

Barium 21.63 % Ba 24.15 % BaO

Lanthanum 10.94 % La 12.83 % La₂O₃

Cerium 33.10 % Ce 38.77 % Ce₂O₃

Carbon 5.67 % C 20.79 % CO₂

Oxygen 22.68 % O

Fluorine 5.98 % F 5.98 % F

- % F -2.52 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaCe_1.5La_0.5(CO₃)₃F₂

Environment:

Found in an alkali-rich pegmatite.

IMA Status:

Valid Species (Pre-IMA) 1898

Locality:

Narsarsuk, Julianehaab district, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek "cordule" = club, in allusion to the shape of the crystals.

Synonym:

Baiyuneboite-(Ce) - Discredited

ICSD 77499

IMA2000-C

PDF 27-34

Cordylite-(Ce) Image

Images:

Cordylite-(Ce) Synchysite-(Ce)

Comments: Yellow crystals of cordylite-(Ce) on light brownish synchysite-(Ce).
Location: NarssÃ¢rssuk (Narsarsuk), Igaliko, Greenland. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Cordylite-(Ce) Crystallography

Axial Ratios:

a:c = 1:4.51934

Cell Dimensions:

a = 5.093, c = 23.017, Z = 2; V = 517.04 Den(Calc)= 4.08

Crystal System:

Hexagonal - Dihexagonal Dipyramidal H-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): 3.846(1), 3.192(0.9), 3.511(0.9),

Forms:

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Forms: ( 1 0 1) ( 4 0 5) ( 0 1 0) ( 0 0 1)

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Physical Properties of Cordylite-(Ce)

Cleavage:

{0001} Distinct

Color:

Colorless, Gray brown, Yellow.

Density:

4.44

Diaphaneity:

Transparent to Translucent

Fracture:

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

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Adamantine - Greasy

Streak:

white

Optical Properties of Cordylite-(Ce)

Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.104 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1683,KPDmeas= 0.1547,KC= 0.1524
Ncalc = 1.62 - 1.68

Optical Data:

Uniaxial (-), e=1.5984, w=1.775, bire=0.1766.

Calculated Properties of Cordylite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.91 gm/cc
note: Specific Gravity of Cordylite-(Ce) =4.44 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Cordylite-(Ce)}= 325.57 barns/electron
U=PE_{Cordylite-(Ce)} x r_electron=1,272.57 barns/cc.

Radioactivity:

GRapi = 41,352.47 (Gamma Ray American Petroleum Institute Units)
Concentration of Cordylite-(Ce) per GRapi unit = 24.18 (PPM)

Cordylite-(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) 735.55 ±183.89 grams of pure Cordylite-(Ce) .

**Estimated Radioactivity from Cordylite-(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 / 7.55 cm	986,431	2.67E-05	41,352.47	13.60
100 gm / 3.50 cm	98,643	2.67E-06	4,135.25	1.36
10 gm / 1.63 cm	9,864	2.67E-07	413.52	0.14
1 gm / 7.55 mm	986	2.67E-08	41.35	0.01
0.1 gm / 3.50 mm	99	2.67E-09	4.14	0.00
0.01 gm / 1.63 mm	10	2.67E-10	0.41	0.00
0.001 gm / 0.75 mm	1	2.67E-11	0.04	0.00

Weight of pure Cordylite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.44 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 ( 2.20 % Th) From Sum REE Elements (44.04 % REE)

Cordylite-(Ce) Classification

Dana Class:

16a.01.07.01 (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 Cordylite-(Ce) Information

References:

PHYS. PROP.(Am.Min.,Vol.79,p767,1994) OPTIC PROP.(Am.Min.,Vol.79,p767,1994)

See Also:

Links to other databases for Cordylite-(Ce) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Cordylite-(Ce)

Ba(Ce,La)2(CO3)3F2
Dana No: 16a.01.07.01 Strunz No: 05.BD.05
Locality:

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