Florencite-(Ce) Mineral Data

General Florencite-(Ce) Information

Chemical Formula:

CeAl3(PO4)2(OH)6

Composition:

Molecular Weight = 513.05 gm

Cerium 27.31 % Ce 31.99 % Ce₂O₃

Aluminum 15.78 % Al 29.81 % Al₂O₃

Phosphorus 12.07 % P 27.67 % P₂O₅

Hydrogen 1.18 % H 10.53 % H₂O

Oxygen 43.66 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CeAl₃(PO₄)₂(OH)₆

IMA Status:

Valid Species (Pre-IMA) 1899

Locality:

Diamantina, Ouro Preto, Minas Gerais, Brazil. Link to MinDat.org Location Data.

Name Origin:

Named for W. Florence and its cerium content.

Name Pronunciation:

Florencite-(Ce) + Pronunciation

Synonym:

ICSD 69214

Koivinite

PDF 8-143

Florencite-(Ce) Image

Images:

Florencite-(Ce)

Comments: Butterscotch colored florencite-(Ce) on a quartz crystal.
Location: Brumado, Bahia, Brazil. Scale: Crystal size 4 mm.
© John Veevaert

Florencite-(Ce) Crystallography

Axial Ratios:

a:c = 1:2.34585

Cell Dimensions:

a = 6.974, c = 16.36, Z = 3; V = 689.09 Den(Calc)= 3.71

Crystal System:

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

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

By Intensity(I/I_o): 2.95(1), 3.5(0.7), 5.71(0.7),

Physical Properties of Florencite-(Ce)

Cleavage:

{0001} Good

Color:

Colorless, Gray, Light yellow, Pink.

Density:

3.457 - 3.71, Average = 3.58

Diaphaneity:

Transparent to Translucent

Fracture:

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

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Resinous - Greasy

Streak:

white

Optical Properties of Florencite-(Ce)

Gladstone-Dale:

CI meas= -0.094 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2053,KPDmeas= 0.2125,KC= 0.1942
Ncalc = 1.67 - 1.72

Optical Data:

Uniaxial (+), w=1.747, e=1.776, bire=0.0290.

Calculated Properties of Florencite-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.54 gm/cc
note: Specific Gravity of Florencite-(Ce) =3.71 gm/cc.

Fermion Index:

Fermion Index = 0.000211332
Boson Index = 0.999788668

Photoelectric:

PE_{Florencite-(Ce)}= 133.13 barns/electron
U=PE_{Florencite-(Ce)} x r_electron= 471.71 barns/cc.

Radioactivity:

GRapi = 27,822.51 (Gamma Ray American Petroleum Institute Units)
Concentration of Florencite-(Ce) per GRapi unit = 35.94 (PPM)

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

**Estimated Radioactivity from Florencite-(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 / 8.01 cm	611,753	1.65E-05	27,822.51	9.15
100 gm / 3.72 cm	61,175	1.65E-06	2,782.25	0.91
10 gm / 1.73 cm	6,118	1.65E-07	278.23	0.09
1 gm / 8.01 mm	612	1.65E-08	27.82	0.01
0.1 gm / 3.72 mm	61	1.65E-09	2.78	0.00
0.01 gm / 1.73 mm	6	1.65E-10	0.28	0.00
0.001 gm / 0.80 mm	1	1.65E-11	0.03	0.00

Weight of pure Florencite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.71 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 ( 1.37 % Th) From Sum REE Elements (27.31 % REE)

Florencite-(Ce) Classification

Dana Class:

41.05.10.02 (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-(Ce) 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-(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 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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Florencite-(Ce)

CeAl3(PO4)2(OH)6
Dana No: 41.05.10.02 Strunz No: 08.BL.13
Locality:

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