Fluocerite-(Ce) Mineral Data

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General Fluocerite-(Ce) Information

Chemical Formula:

(Ce,La)F3

Composition:

Molecular Weight = 196.99 gm

Lanthanum 7.05 % La 8.27 % La₂O₃

Cerium 64.02 % Ce 74.98 % Ce₂O₃

Fluorine 28.93 % F 28.93 % F

- % F -12.18 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce_0.9La_0.1F₃

Environment:

Granitic rocks.

IMA Status:

Valid Species (Pre-IMA) 1845

Locality:

Falun and Osterby, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named after its chemical composition containing fluorine (Latin, fluere = "to flow") and cerium (Named after the asteroid Ceres).

Name Pronunciation:

Fluocerite-(Ce) + Pronunciation

Synonym:

ICSD 4

PDF 38-4524

Tysonite

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Fluocerite-(Ce) Crystallography

Axial Ratios:

a:c = 1:1.02247

Cell Dimensions:

a = 7.12, c = 7.28, Z = 6; V = 319.61 Den(Calc)= 6.14

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mcm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.19(1), 2(0.8), 2.05(0.8),

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Forms: ( 0 3 2) ( 3 3 2) ( 1 1 0) ( 0 1 0) ( 0 0 1)

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Crystal Structure:

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Cheetham A K , Fender B E F , Fuess H , Wright A F , Acta Crystallographica, Section B , 32 (1976) p.94-97, A powder neutron diffraction study of lanthanum and cerium trifluorides, Locality: synthetic

Physical Properties of Fluocerite-(Ce)

Cleavage:

{001} Perfect

Color:

Pale wax yellow, Yellowish brown, Reddish brown.

Density:

6.13

Diaphaneity:

Transparent to translucent

Fracture:

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

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

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

Hardness:

4.5-5 - Near Apatite

Luminescence:

Non-fluorescent.

Luster:

Waxy

Streak:

yellow white

Optical Properties of Fluocerite-(Ce)

Optical Data:

Uniaxial (-), e=1.607-1.611, w=1.612-1.618, bire=0.0050-0.0070.

Calculated Properties of Fluocerite-(Ce)

Electron Density:

Bulk Density (Electron Density)=5.29 gm/cc
note: Specific Gravity of Fluocerite-(Ce) =6.14 gm/cc.

Fermion Index:

Fermion Index = 0.0000634628
Boson Index = 0.9999365372

Photoelectric:

PE_{Fluocerite-(Ce)}= 378.18 barns/electron
U=PE_{Fluocerite-(Ce)} x r_electron=2,001.53 barns/cc.

Radioactivity:

GRapi = 65,341.76 (Gamma Ray American Petroleum Institute Units)
Concentration of Fluocerite-(Ce) per GRapi unit = 15.30 (PPM)

Fluocerite-(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) 465.50 ±116.38 grams of pure Fluocerite-(Ce) .

**Estimated Radioactivity from Fluocerite-(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 / 6.78 cm	1,591,897	4.30E-05	65,341.76	21.48
100 gm / 3.14 cm	159,190	4.30E-06	6,534.18	2.15
10 gm / 1.46 cm	15,919	4.30E-07	653.42	0.21
1 gm / 6.78 mm	1,592	4.30E-08	65.34	0.02
0.1 gm / 3.14 mm	159	4.30E-09	6.53	0.00
0.01 gm / 1.46 mm	16	4.30E-10	0.65	0.00
0.001 gm / 0.68 mm	2	4.30E-11	0.07	0.00

Weight of pure Fluocerite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.14 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 ( 3.55 % Th) From Sum REE Elements (71.07 % REE)

Fluocerite-(Ce) Classification

Dana Class:

09.03.04.01 (09)Anhydrous and Hydrated Halides

(09.03)Dana Type

(09.03.04)Fluocerite Group

09.03.04.01 Fluocerite-(Ce) (Ce,La)F3 P 6₃/mcm 6/m 2/m 2/m

09.03.04.02 Fluocerite-(La) (La,Ce)F3 Unk Hex

Strunz Class:

03.AC.15 03 - HALIDES

03.A - Simple Halides, Without H2O

03.AC -M:X = 1:3

03.AC.15 Fluocerite-(Ce) (Ce,La)F3 P 6₃/mcm 6/m 2/m 2/m

03.AC.15 Fluocerite-(La) (La,Ce)F3 Unk Hex

Other Fluocerite-(Ce) Information

References:

NAME( Emsley91) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Fluocerite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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

Fluocerite-(Ce)

(Ce,La)F3
Dana No: 09.03.04.01 Strunz No: 03.AC.15
Locality:

Notes: