Rhabdophane-(La) Mineral Data

Rhabdophane-(La) Mineral Data +

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General Rhabdophane-(La) Information

Chemical Formula:

(La,Ce)PO4·(H2O)

Composition:

Molecular Weight = 252.19 gm

Lanthanum 41.31 % La 48.45 % La₂O₃

Cerium 13.89 % Ce 16.27 % Ce₂O₃

Phosphorus 12.28 % P 28.14 % P₂O₅

Hydrogen 0.80 % H 7.14 % H₂O

Oxygen 31.72 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

La_0.75Ce_0.25(PO₄)·(H₂O)

IMA Status:

Approved IMA 1959

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named to distinguish the La rich form of rhabdophane-Ce.

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Rhabdophane-(La) Crystallography

Axial Ratios:

a:c = 1:0.91547

Cell Dimensions:

a = 6.98, c = 6.39, Z = 3; V = 269.61 Den(Calc)= 4.66

Crystal System:

Hexagonal - TrapezohedralH-M Symbol (6 2 2) Space Group: P 6₂22

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

By Intensity(I/I_o): 3.02(1), 2.83(0.8), 4.4(0.8),

Physical Properties of Rhabdophane-(La)

Cleavage:

None

Color:

Brown, Pink.

Density:

3.94

Diaphaniety:

Translucent

Hardness:

3-4 - Calcite-Fluorite

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Rhabdophane-(La)

Gladstone-Dale:

CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.148 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1456,KPDmeas= 0.1722,KC= 0.1709

Optical Data:

Uniaxial (+), w=1.654, e=1.703, bire=0.0490.

Calculated Properties of Rhabdophane-(La)

Electron Density:

r_electron=3.57 gm/cc
note: r_{Rhabdophane-(La)}=3.94 gm/cc.

Fermion Index

Fermion Index = 0.00052
Boson Index = 0.99948

Photoelectric:

PE_{Rhabdophane-(La)}= 267.44 barns/electron
U=PE_{Rhabdophane-(La)} x r_electron= 954.71 barns/cc.

Radioactivity:

GRapi = 53,346.67 (Gamma Ray American Petroleum Institute Units)

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

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 570.17 ±142.54 grams of pure Rhabdophane-(La) .

**Estimated Radioactivity from Rhabdophane-(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 / 7.86 cm	1,236,449	3.34E-05	53,346.67	17.54
100 gm / 3.65 cm	123,645	3.34E-06	5,334.67	1.75
10 gm / 1.69 cm	12,364	3.34E-07	533.47	0.18
1 gm / 7.86 mm	1,236	3.34E-08	53.35	0.02
0.1 gm / 3.65 mm	124	3.34E-09	5.33	0.00
0.01 gm / 1.69 mm	12	3.34E-10	0.53	0.00
0.001 gm / 0.79 mm	1	3.34E-11	0.05	0.00

Weight of pure Rhabdophane-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.94 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 ( 2.76 % Th) From Sum REE Elements (55.20 % REE)

Rhabdophane-(La) Classification

Dana Class:

40.4.7.2 (40)Hydrated Phosphates, etc

(40.4)where A+++ XO4 · x(H2O)

(40.4.7)Dana Group

40.4.7.1 Rhabdophane-(Ce) (Ce,La)PO4·(H2O) P 6₂22 6 2 2

40.4.7.2 Rhabdophane-(La) (La,Ce)PO4·(H2O) P 6₂22 6 2 2

40.4.7.3 Rhabdophane-(Nd) (Nd,Ce,La)PO4·(H2O) P 6₂22 6 2 2

40.4.7.4 Grayite (Th,Pb,Ca)PO4·(H2O) P 6₂22 6 2 2

40.4.7.5 Brockite (Ca,Th,Ce)(PO4)·(H2O) P 6₂22 6 2 2

40.4.7.6 Tristramite (Ca,U,Fe)(PO4,SO4)·2(H2O) P 6₂22 6 2 2

Strunz Class:

VII/C.29-20 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.29 - Rhabdophane group

VII/C.29-10 Rhabdophane-(Ce) (Ce,La)PO4·(H2O) P 6₂22 6 2 2

VII/C.29-20 Rhabdophane-(La) (La,Ce)PO4·(H2O) P 6₂22 6 2 2

VII/C.29-30 Rhabdophane-(Nd) (Nd,Ce,La)PO4·(H2O) P 6₂22 6 2 2

VII/C.29-40 Brockite (Ca,Th,Ce)(PO4)·(H2O) P 6₂22 6 2 2

VII/C.29-50 Tristramite (Ca,U,Fe)(PO4,SO4)·2(H2O) P 6₂22 6 2 2

VII/C.29-60 Grayite (Th,Pb,Ca)PO4·(H2O) P 6₂22 6 2 2

VII/C.29-70 Ningyoite (U,Ca,Ce)2(PO4)2·1-2(H2O) P 222 2 2 2

Other Rhabdophane-(La) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Rhabdophane-(La) :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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Rhabdophane-(La)

(La,Ce)PO4·(H2O)
Dana No: 40.4.7.2 Strunz No: VII/C.29-20
Locality:

Notes: