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Florencite-(La) Mineral Data

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General Florencite-(La) Information

Help on Chemical  Formula: Chemical Formula: (La,Ce)Al3(PO4)2(OH)6
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: La0.75Ce0.25Al3(PO4)2(OH)6
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Shituru deposit, Likasi, Katanga (Shaba), Congo (Za�re). Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for W. Florence and its lanthanum content.
Help on Name Pronunciation: Name Pronunciation: Florencite-(La) + Pronunciation Say FLORENCITE-(LA)
 

Florencite-(La) Image

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  Florencite-(La)

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

Florencite-(La) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.32546
Help on Cell Dimensions: Cell Dimensions: a = 6.987, c = 16.248, Z = 3; V = 686.93 Den(Calc)= 3.71
Help on Crystal System: 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/Io): 2.93(1), 5.67(0.9), 2.171(0.8),
 

Physical Properties of Florencite-(La)

Help on Cleavage: Cleavage: {0001} Good
Help on Color: Color: Colorless, Light yellow.
Help on Density: Density: 3.52
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Resinous - Greasy
Help on Streak: Streak: white
 

Optical Properties of Florencite-(La)

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.694, e=1.701, bire=0.0070.
 

Calculated Properties of Florencite-(La)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.36 gm/cc
note: Specific Gravity of Florencite-(La) =3.52 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0003947839
Boson Index = 0.9996052161
Help on Photoelectric: Photoelectric: PEFlorencite-(La) = 125.90 barns/electron
U=PEFlorencite-(La) x relectron= 422.71 barns/cc.
Help on Radioactivity: 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
Bequerols
(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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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:

 

 
   
 


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