Arsenoflorencite-(La) Mineral Data

General Arsenoflorencite-(La) Information

Chemical Formula:

(La,Sr)Al3(AsO4,SO4,PO4)2(OH)6

Composition:

Molecular Weight = 564.57 gm

Strontium 3.10 % Sr 3.67 % SrO

Lanthanum 12.30 % La 14.43 % La₂O₃

Cerium 2.48 % Ce 2.91 % Ce₂O₃

La,Ce,Pr,Nd,Sm, 5.10 % RE 5.95 % REE₂O₃

Aluminum 14.34 % Al 27.09 % Al₂O₃

Arsenic 18.58 % As 28.50 % As₂O₅

Phosphorus 1.65 % P 3.77 % P₂O₅

Hydrogen 1.07 % H 9.57 % H₂O

Sulfur 1.70 % S 4.25 % SO₃

Oxygen 39.67 % O

______ ______

100.00 % 100.14 % = TOTAL OXIDE

Empirical Formula:

La_0.5Sr_0.2Ce_0.1REE_0.2Al₃(AsO₄)_1.4(SO₄)_0.3(PO₄)_0.3(OH)₆

IMA Status:

Not Approved IMA 1991

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named as the arsenic analog of florencite and the dominant rare earth element, Lanthanum.

Name Pronunciation:

Arsenoflorencite-(La) + Pronunciation

Arsenoflorencite-(La) Image

Images:

Arsenoflorencite-(La)

Comments: BSE image of four grains of orange-red Arsenoflorencite-(La) from heavy concentrates of gold-bearing sedimentary rocks.
Location: Grubependity Lake, Maldinskii Region, Prepolar Ural, Russia. Scale: See Image.
© Diederik Visser

Arsenoflorencite-(La) Crystallography

Axial Ratios:

a:c = 1:2.38285

Cell Dimensions:

a = 7, c = 16.68, Z = 3; V = 707.82 Den(Calc)= 3.97

Crystal System:

Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 2.95(1), 3.51(0.6), 5.65(0.55),

Physical Properties of Arsenoflorencite-(La)

Color:

White.

Density:

4.1 - 4.2, Average = 4.15

Diaphaneity:

Transparent

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Arsenoflorencite-(La)

Gladstone-Dale:

CI meas= 0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1877,KPDmeas= 0.1795,KC= 0.1878
Ncalc = 1.75 - 1.79

Optical Data:

Uniaxial (+), w=1.74, e=1.75, bire=0.0100.

Calculated Properties of Arsenoflorencite-(La)

Electron Density:

Bulk Density (Electron Density)=3.75 gm/cc
note: Specific Gravity of Arsenoflorencite-(La) =3.97 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Arsenoflorencite-(La)}= 115.60 barns/electron
U=PE_{Arsenoflorencite-(La)} x r_electron= 433.41 barns/cc.

Radioactivity:

GRapi = 20,050.17 (Gamma Ray American Petroleum Institute Units)
Concentration of Arsenoflorencite-(La) per GRapi unit = 49.87 (PPM)

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

**Estimated Radioactivity from Arsenoflorencite-(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 / 7.84 cm	445,829	1.20E-05	20,050.17	6.59
100 gm / 3.64 cm	44,583	1.20E-06	2,005.02	0.66
10 gm / 1.69 cm	4,458	1.20E-07	200.50	0.07
1 gm / 7.84 mm	446	1.20E-08	20.05	0.01
0.1 gm / 3.64 mm	45	1.20E-09	2.01	0.00
0.01 gm / 1.69 mm	4	1.20E-10	0.20	0.00
0.001 gm / 0.78 mm	0	1.20E-11	0.02	0.00

Weight of pure Arsenoflorencite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.97 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 ( 0.99 % Th) From Sum REE Elements (19.88 % REE)

Arsenoflorencite-(La) Classification

Dana Class:

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

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

(41.05.11)Arsenoflorencite Group

41.05.11.01 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

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

41.05.11.03 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

41.05.11.04 Graulichite-(Ce)! CeFe3(AsO4)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 Arsenoflorencite-(La) Information

References:

PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)

See Also:

Links to other databases for Arsenoflorencite-(La) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Ecole des Mines de Paris
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Arsenoflorencite-(La)

(La,Sr)Al3(AsO4,SO4,PO4)2(OH)6
Dana No: 41.05.11.03 Strunz No: 08.BL.13
Locality:

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