Florencite-(Nd) Mineral Data

General Florencite-(Nd) Information

Chemical Formula:

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

Composition:

Molecular Weight = 516.14 gm

Cerium 6.79 % Ce 7.95 % Ce₂O₃

Aluminum 15.68 % Al 29.63 % Al₂O₃

Phosphorus 12.00 % P 27.50 % P₂O₅

Hydrogen 1.17 % H 10.47 % H₂O

Neodymium 20.96 % Nd 24.45 % Nd₂O₃

Oxygen 43.40 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Nd_0.75Ce_0.25Al₃(PO₄)₂(OH)₆

IMA Status:

Approved IMA 1986

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named for W. Florence and its neodymium content.

Name Pronunciation:

Florencite-(Nd) + Pronunciation

Florencite-(Nd) Image

Images:

Florencite-(Nd)

Comments: Brown earthy pulverulent aggregate of florencite-(Nd) forming a thin coating on matrix.
Location: Sausalito Road Quarry, Sausalito, Marin County, California, USA. Scale: See Image.
© Rruff Database

Florencite-(Nd) Crystallography

Axial Ratios:

a:c = 1:2.33237

Cell Dimensions:

a = 6.98, c = 16.28, Z = 3; V = 686.90 Den(Calc)= 3.74

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): 2.93(1), 2.17(0.8), 5.66(0.8),

Physical Properties of Florencite-(Nd)

Cleavage:

{???} Good

Color:

Yellow, Pink.

Density:

3.5 - 3.55, Average = 3.52

Diaphaneity:

Transparent to Translucent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Resinous - Greasy

Streak:

white

Optical Properties of Florencite-(Nd)

Gladstone-Dale:

CI meas= -0.07 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1939,KPDmeas= 0.2057,KC= 0.1922
Ncalc = 1.67 - 1.72

Optical Data:

Uniaxial (+), w=1.72, e=1.73, bire=0.0100.

Calculated Properties of Florencite-(Nd)

Electron Density:

Bulk Density (Electron Density)=3.57 gm/cc
note: Specific Gravity of Florencite-(Nd) =3.74 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Florencite-(Nd)}= 148.92 barns/electron
U=PE_{Florencite-(Nd)} x r_electron= 531.99 barns/cc.

Radioactivity:

GRapi = 28,268.98 (Gamma Ray American Petroleum Institute Units)
Concentration of Florencite-(Nd) per GRapi unit = 35.37 (PPM)

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

**Estimated Radioactivity from Florencite-(Nd)** - 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 / 7.99 cm	621,513	1.68E-05	28,268.98	9.29
100 gm / 3.71 cm	62,151	1.68E-06	2,826.90	0.93
10 gm / 1.72 cm	6,215	1.68E-07	282.69	0.09
1 gm / 7.99 mm	622	1.68E-08	28.27	0.01
0.1 gm / 3.71 mm	62	1.68E-09	2.83	0.00
0.01 gm / 1.72 mm	6	1.68E-10	0.28	0.00
0.001 gm / 0.80 mm	1	1.68E-11	0.03	0.00

Weight of pure Florencite-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.74 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 ( 1.39 % Th) From Sum REE Elements (27.75 % REE)

Florencite-(Nd) Classification

Dana Class:

41.05.10.04 (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-(Nd) 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-(Nd) :
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

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Florencite-(Nd)

(Nd,Ce)Al3(PO4)2(OH)6
Dana No: 41.05.10.04 Strunz No: 08.BL.13
Locality:

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