General Arsenoflorencite-(La) Information
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Chemical Formula: |
(La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 |
Composition: |
Molecular Weight = 564.57 gm |
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Strontium 3.10 % Sr 3.67 % SrO |
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Lanthanum 12.30 % La 14.43 % La2O3 |
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Cerium 2.48 % Ce 2.91 % Ce2O3 |
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La,Ce,Pr,Nd,Sm, 5.10 % RE 5.95 % REE2O3 |
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Aluminum 14.34 % Al 27.09 % Al2O3 |
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Arsenic 18.58 % As 28.50 % As2O5 |
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Phosphorus 1.65 % P 3.77 % P2O5 |
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Hydrogen 1.07 % H 9.57 % H2O |
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Sulfur 1.70 % S 4.25 % SO3 |
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Oxygen 39.67 % O |
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______ ______ |
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100.00 % 100.14 % = TOTAL OXIDE |
Empirical Formula: |
La0.5Sr0.2Ce0.1REE0.2Al3(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. |
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Search for Arsenoflorencite-(La) Images |
Images:
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Arsenoflorencite-(La) Crystallography
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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 PyramidalH-M Symbol (3m) Space Group: R 3m |
X Ray Diffraction: |
By Intensity(I/Io): 2.95(1), 3.51(0.6), 5.65(0.55), |
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Physical Properties of Arsenoflorencite-(La)
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Color: |
White. |
Density: |
4.1 - 4.2, Average = 4.15 |
Diaphaniety: |
Transparent |
Hardness: |
3.5 - Copper Penny |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Arsenoflorencite-(La)
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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 |
Optical Data: |
Uniaxial (+), w=1.74, e=1.75, bire=0.0100. |
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Calculated Properties of Arsenoflorencite-(La)
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Electron Density: |
relectron=3.75 gm/cc note: rArsenoflorencite-(La) =3.97 gm/cc. |
Fermion Index |
Fermion Index = 0.01209 Boson Index = 0.98791 |
Photoelectric: |
PEArsenoflorencite-(La) = 115.60 barns/electron U=PEArsenoflorencite-(La) x relectron= 433.41 barns/cc. |
Radioactivity: |
GRapi = 20,050.16 (Gamma Ray American Petroleum Institute Units)
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 |
20,050.16 |
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)
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Arsenoflorencite-(La) Classification
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Dana Class: |
41.5.11.3 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen |
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(41.5)where (A B)2 (XO4) Zq |
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(41.5.11)Dana Group |
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41.5.11.1 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m |
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41.5.11.2 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m |
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41.5.11.3 Arsenoflorencite-(La) * (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m |
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41.5.11.4 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m |
Strunz Class: |
VII/B.36-125 VII - Phosphates, Arsenates and Vanadates |
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VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb |
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VII/B.36 - Crandallite group |
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VII/B.36-10 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m |
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VII/B.36-20 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O) R 3m 3m |
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VII/B.36-30 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m |
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VII/B.36-40 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O) R 3m 3 2/m |
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VII/B.36-50 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m |
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VII/B.36-60 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m |
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VII/B.36-70 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m |
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VII/B.36-80 Philipsbornite PbAl3(AsO4)2(OH)5·(H2O) R 3m-,R 3m Trig |
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VII/B.36-90 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-100 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m |
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VII/B.36-110 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-120 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-125 Arsenoflorencite-(La) (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m |
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VII/B.36-130 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-135 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m |
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VII/B.36-140 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-150 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-150* Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5·(H2O) R 3m 3m |
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VII/B.36-152 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-155 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m |
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VII/B.36-160 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m |
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VII/B.36-170 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m |
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Other Arsenoflorencite-(La) Information
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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 -Google Images
4 -Google Scholar
5 -MinDAT
6 -MinMax(Deutsch)
7 -MinMax(English)
8 -Mineralienatlas (Deutsch)
9 -QUT Mineral Atlas
10 -École des Mines de Paris
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Print or Cut-and-Paste your Arsenoflorencite-(La) Specimen Label here :
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Arsenoflorencite-(La)
(La,Sr)Al3(AsO4,SO4,PO4)2(OH)6
Dana No: 41.5.11.3 Strunz No: VII/B.36-125
Locality:
Notes:
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