Rhabdophane-(Nd) Mineral Data

Rhabdophane-(Nd) Mineral Data +

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General Rhabdophane-(Nd) Information

Chemical Formula:

(Nd,Ce,La)PO4·(H2O)

Composition:

Molecular Weight = 255.21 gm

Lanthanum 16.33 % La 19.15 % La₂O₃

Cerium 5.49 % Ce 6.43 % Ce₂O₃

Phosphorus 12.14 % P 27.81 % P₂O₅

Hydrogen 0.79 % H 7.06 % H₂O

Neodymium 33.91 % Nd 39.55 % Nd₂O₃

Oxygen 31.35 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Nd_0.6La_0.3Ce_0.1(PO₄)·(H₂O)

IMA Status:

Approved IMA 1959

Locality:

Link to MinDat.org Location Data.

Name Origin:

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

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Rhabdophane-(Nd) Crystallography

Axial Ratios:

a:c = 1:0.91347

Cell Dimensions:

a = 7.05, c = 6.44, Z = 3; V = 277.20 Den(Calc)= 4.59

Crystal System:

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

Physical Properties of Rhabdophane-(Nd)

Cleavage:

None

Color:

Yellowish white, Pink, Reddish brown.

Density:

Diaphaniety:

Translucent

Hardness:

3-4 - Calcite-Fluorite

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Rhabdophane-(Nd)

Optical Data:

NCalc= 1.77 - from Gladstone-Dale relationship (KC = 0.1667) where Ncalc=Dcalc*KC+1
NCalc= 1.67 - from Gladstone-Dale relationship (KC = 0.1667) where Ncalc=Dmeas*KC+1

Calculated Properties of Rhabdophane-(Nd)

Electron Density:

r_electron=4.17 gm/cc
note: r_{Rhabdophane-(Nd)}=4.59 gm/cc.

Fermion Index

Fermion Index = 0.06974
Boson Index = 0.93026

Photoelectric:

PE_{Rhabdophane-(Nd)}= 301.54 barns/electron
U=PE_{Rhabdophane-(Nd)} x r_electron=1,257.09 barns/cc.

Radioactivity:

GRapi = 53,990.34 (Gamma Ray American Petroleum Institute Units)

Rhabdophane-(Nd) 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) 563.37 ±140.84 grams of pure Rhabdophane-(Nd) .

**Estimated Radioactivity from Rhabdophane-(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 / 7.47 cm	1,248,321	3.37E-05	53,990.34	17.75
100 gm / 3.47 cm	124,832	3.37E-06	5,399.03	1.78
10 gm / 1.61 cm	12,483	3.37E-07	539.90	0.18
1 gm / 7.47 mm	1,248	3.37E-08	53.99	0.02
0.1 gm / 3.47 mm	125	3.37E-09	5.40	0.00
0.01 gm / 1.61 mm	12	3.37E-10	0.54	0.00
0.001 gm / 0.75 mm	1	3.37E-11	0.05	0.00

Weight of pure Rhabdophane-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.59 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 ( 2.79 % Th) From Sum REE Elements (55.73 % REE)

Rhabdophane-(Nd) Classification

Dana Class:

40.4.7.3 (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.29-30 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-(Nd) Information

References:

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

See Also:

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

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Rhabdophane-(Nd)

(Nd,Ce,La)PO4·(H2O)
Dana No: 40.4.7.3 Strunz No: VII/C.29-30
Locality:

Notes: