Fluocerite-(La) Mineral Data

General Fluocerite-(La) Information

Chemical Formula:

(La,Ce)F3

Composition:

Molecular Weight = 196.02 gm

Lanthanum 63.78 % La 74.79 % La₂O₃

Cerium 7.15 % Ce 8.37 % Ce₂O₃

Fluorine 29.08 % F 29.08 % F

- % F -12.24 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

La_0.9Ce_0.1F₃

Environment:

In hydrothermal quartz veins in granite.

IMA Status:

Approved IMA 1969

Locality:

Central Kazakhstan. 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) with the modifier La-lanthanum (Greek, lanthanein = "to lie hidden").

Name Pronunciation:

Fluocerite-(La) + Pronunciation

Synonym:

Fluocerite

ICSD 3

PDF 32-483

Fluocerite-(La) Crystallography

Axial Ratios:

a:c = 1:1.7642

Cell Dimensions:

a = 4.135, c = 7.295, Z = 2; V = 108.02 Den(Calc)= 6.03

Crystal System:

Hexagonal Space Group: Unk

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

By Intensity(I/I_o): 3.19(1), 1.048(0.7), 2.07(0.6),

Forms:

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

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Physical Properties of Fluocerite-(La)

Cleavage:

{???} Indistinct, {???} Imperfect

Color:

Greenish yellow.

Density:

5.93

Diaphaneity:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Fluocerite-(La)

Optical Data:

Uniaxial (-), e=1.603, w=1.609, bire=0.0060.

Calculated Properties of Fluocerite-(La)

Electron Density:

Bulk Density (Electron Density)=5.17 gm/cc
note: Specific Gravity of Fluocerite-(La) =6.03 gm/cc.

Fermion Index:

Fermion Index = 0.0005739848
Boson Index = 0.9994260152

Photoelectric:

PE_{Fluocerite-(La)}= 358.13 barns/electron
U=PE_{Fluocerite-(La)} x r_electron=1,853.00 barns/cc.

Radioactivity:

GRapi = 64,914.84 (Gamma Ray American Petroleum Institute Units)
Concentration of Fluocerite-(La) per GRapi unit = 15.40 (PPM)

Fluocerite-(La) 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) 468.56 ±117.14 grams of pure Fluocerite-(La) .

**Estimated Radioactivity from Fluocerite-(La)** - 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 / 6.82 cm	1,588,698	4.29E-05	64,914.84	21.34
100 gm / 3.16 cm	158,870	4.29E-06	6,491.48	2.13
10 gm / 1.47 cm	15,887	4.29E-07	649.15	0.21
1 gm / 6.82 mm	1,589	4.29E-08	64.91	0.02
0.1 gm / 3.16 mm	159	4.29E-09	6.49	0.00
0.01 gm / 1.47 mm	16	4.29E-10	0.65	0.00
0.001 gm / 0.68 mm	2	4.29E-11	0.06	0.00

Weight of pure Fluocerite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.03 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 (70.92 % REE)

Fluocerite-(La) Classification

Dana Class:

09.03.04.02 (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-(La) Information

References:

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

See Also:

Links to other databases for Fluocerite-(La) :
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

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

Fluocerite-(La)

(La,Ce)F3
Dana No: 09.03.04.02 Strunz No: 03.AC.15
Locality:

Notes:

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