Florencite-(La) Mineral Data

General Florencite-(La) Information

Chemical Formula:

(La,Ce)Al3(PO4)2(OH)6

Composition:

Molecular Weight = 512.14 gm

Lanthanum 20.34 % La 23.86 % La₂O₃

Cerium 6.84 % Ce 8.01 % Ce₂O₃

Aluminum 15.81 % Al 29.86 % Al₂O₃

Phosphorus 12.10 % P 27.72 % P₂O₅

Hydrogen 1.18 % H 10.55 % H₂O

Oxygen 43.74 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

La_0.75Ce_0.25Al₃(PO₄)₂(OH)₆

IMA Status:

Approved IMA 1981

Locality:

Shituru deposit, Likasi, Katanga (Shaba), Congo (Zaïre). Link to MinDat.org Location Data.

Name Origin:

Named for W. Florence and its lanthanum content.

Name Pronunciation:

Florencite-(La) + Pronunciation

Florencite-(La) Image

Images:

Florencite-(La)

Comments: Green, acicular crystalline aggregates of florencite-(La).
Location: IgarapÃ© Bahia Mine, CarajÃ¡s ridge, ParÃ¡, North Region, Brazil. Scale: Picture size 4.5 mm.
© Thomas Witzke / Abraxas-Verlag

Florencite-(La) Crystallography

Axial Ratios:

a:c = 1:2.32546

Cell Dimensions:

a = 6.987, c = 16.248, Z = 3; V = 686.93 Den(Calc)= 3.71

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.93(1), 5.67(0.9), 2.171(0.8),

Physical Properties of Florencite-(La)

Cleavage:

{0001} Good

Color:

Colorless, Light yellow.

Density:

3.52

Diaphaneity:

Transparent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Resinous - Greasy

Streak:

white

Optical Properties of Florencite-(La)

Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.188,KPDmeas= 0.1982,KC= 0.1953
Ncalc = 1.69 - 1.72

Optical Data:

Uniaxial (+), w=1.694, e=1.701, bire=0.0070.

Calculated Properties of Florencite-(La)

Electron Density:

Bulk Density (Electron Density)=3.36 gm/cc
note: Specific Gravity of Florencite-(La) =3.52 gm/cc.

Fermion Index:

Fermion Index = 0.0003947839
Boson Index = 0.9996052161

Photoelectric:

PE_{Florencite-(La)}= 125.90 barns/electron
U=PE_{Florencite-(La)} x r_electron= 422.71 barns/cc.

Radioactivity:

GRapi = 27,655.47 (Gamma Ray American Petroleum Institute Units)
Concentration of Florencite-(La) per GRapi unit = 36.16 (PPM)

Florencite-(La) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Florencite-(La)** - 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 / 8.16 cm	608,869	1.65E-05	27,655.47	9.09
100 gm / 3.79 cm	60,887	1.65E-06	2,765.55	0.91
10 gm / 1.76 cm	6,089	1.65E-07	276.55	0.09
1 gm / 8.16 mm	609	1.65E-08	27.66	0.01
0.1 gm / 3.79 mm	61	1.65E-09	2.77	0.00
0.01 gm / 1.76 mm	6	1.65E-10	0.28	0.00
0.001 gm / 0.82 mm	1	1.65E-11	0.03	0.00

Weight of pure Florencite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.52 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 ( 1.36 % Th) From Sum REE Elements (27.18 % REE)

Florencite-(La) Classification

Dana Class:

41.05.10.03 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.10)Dussertite Group

41.05.10.01 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m

41.05.10.02 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m

41.05.10.03 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

41.05.10.04 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

Strunz Class:

08.BL.13 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.13 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.13 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

08.BL.13 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

08.BL.13 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m

08.BL.13 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.13 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m

Other Florencite-(La) Information

References:

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

See Also:

Links to other databases for Florencite-(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 Florencite-(La) Specimen Label here :

Florencite-(La)

(La,Ce)Al3(PO4)2(OH)6
Dana No: 41.05.10.03 Strunz No: 08.BL.13
Locality:

Notes: