Rhabdophane-(Ce) Mineral Data

General Rhabdophane-(Ce) Information

Chemical Formula:

(Ce,La)PO4•(H2O)

Composition:

Molecular Weight = 252.80 gm

Lanthanum 13.74 % La 16.11 % La₂O₃

Cerium 41.57 % Ce 48.69 % Ce₂O₃

Phosphorus 12.25 % P 28.07 % P₂O₅

Hydrogen 0.80 % H 7.13 % H₂O

Oxygen 31.64 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce_0.75La_0.25(PO₄)•(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1878

Locality:

Mine dumps of Fowey Consuls, Cornwall, England, UK. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek, "rod" and "to appear", in allusion to the characteristic bands shown in its spectrum.

Name Pronunciation:

Rhabdophane-(Ce) + Pronunciation

Synonym:

ICSD 31563

PDF 46-1303

Rhabdophane-(Ce) Image

Images:

Rhabdophane-(Ce)

Comments: White acicular crystals rhabdophane-(Ce) on matrix.
Location: Reinersreuth Quarry (KÃ¶hlerloch), GroÃŸer Waldstein, WeiÃŸenstadt, Fichtelgebirge, Bavaria, Germany. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Rhabdophane-(Ce) Crystallography

Axial Ratios:

a:c = 1:0.91551

Cell Dimensions:

a = 6.96, c = 6.372, Z = 3; V = 267.32 Den(Calc)= 4.71

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): 2.82(1), 3.01(0.9), 6.03(0.55),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Mooney R C L , Acta Crystallographica , 3 (1950) p.337-340, X-ray diffraction study of cerous phosphate and related crystals, I. Hexagonal modification, Locality: synthetic

Physical Properties of Rhabdophane-(Ce)

Cleavage:

None

Color:

White, Brownish white, Yellowish white, Pinkish white.

Density:

Diaphaneity:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

3.5 - Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Greasy (Oily)

Streak:

white

Optical Properties of Rhabdophane-(Ce)

Gladstone-Dale:

CI meas= -0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.103 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.152,KPDmeas= 0.179,KC= 0.1696
Ncalc = 1.68 - 1.8

Optical Data:

Uniaxial (+), w=1.688, e=1.744, bire=0.0560.

Calculated Properties of Rhabdophane-(Ce)

Electron Density:

Bulk Density (Electron Density)=3.63 gm/cc
note: Specific Gravity of Rhabdophane-(Ce) =4.00 gm/cc.

Fermion Index:

Fermion Index = 0.0002767203
Boson Index = 0.9997232797

Photoelectric:

PE_{Rhabdophane-(Ce)}= 277.11 barns/electron
U=PE_{Rhabdophane-(Ce)} x r_electron=1,006.27 barns/cc.

Radioactivity:

GRapi = 53,555.78 (Gamma Ray American Petroleum Institute Units)
Concentration of Rhabdophane-(Ce) per GRapi unit = 18.67 (PPM)

Rhabdophane-(Ce) 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) 567.94 ±141.99 grams of pure Rhabdophane-(Ce) .

**Estimated Radioactivity from Rhabdophane-(Ce)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.82 cm	1,238,850	3.35E-05	53,555.78	17.61
100 gm / 3.63 cm	123,885	3.35E-06	5,355.58	1.76
10 gm / 1.68 cm	12,389	3.35E-07	535.56	0.18
1 gm / 7.82 mm	1,239	3.35E-08	53.56	0.02
0.1 gm / 3.63 mm	124	3.35E-09	5.36	0.00
0.01 gm / 1.68 mm	12	3.35E-10	0.54	0.00
0.001 gm / 0.78 mm	1	3.35E-11	0.05	0.00

Weight of pure Rhabdophane-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.00 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 ( 2.77 % Th) From Sum REE Elements (55.31 % REE)

Rhabdophane-(Ce) Classification

Dana Class:

40.04.07.01 (40)Hydrated Phosphates, etc

(40.04)where A+++ XO4 · x(H2O)

(40.04.07)Rhabdophane Group

40.04.07.01 Rhabdophane-(Ce) (Ce,La)PO4•(H2O) P 6₂22 6 2 2

40.04.07.02 Rhabdophane-(La) (La,Ce)PO4•(H2O) P 6₂22 6 2 2

40.04.07.03 Rhabdophane-(Nd) (Nd,Ce,La)PO4•(H2O) P 6₂22 6 2 2

40.04.07.04 Grayite (Th,Pb,Ca)PO4•(H2O) P 6₂22 6 2 2

40.04.07.05 Brockite (Ca,Th,Ce)(PO4)•(H2O) P 6₂22 6 2 2

40.04.07.06 Tristramite (Ca,U,Fe)(PO4,SO4)•2(H2O) P 6₂22 6 2 2

Strunz Class:

08.CJ.45 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CJ -With only large cations

08.CJ.45 Brockite (Ca,Th,Ce)(PO4)•(H2O) P 6₂22 6 2 2

08.CJ.45 Grayite (Th,Pb,Ca)PO4•(H2O) P 6₂22 6 2 2

08.CJ.45 Rhabdophane-(Ce) (Ce,La)PO4•(H2O) P 6₂22 6 2 2

08.CJ.45 Rhabdophane-(La) (La,Ce)PO4•(H2O) P 6₂22 6 2 2

08.CJ.45 Rhabdophane-(Nd) (Nd,Ce,La)PO4•(H2O) P 6₂22 6 2 2

08.CJ.45 Tristramite (Ca,U,Fe)(PO4,SO4)•2(H2O) P 6₂22 6 2 2

Other Rhabdophane-(Ce) 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-(Ce) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Rhabdophane-(Ce) Specimen Label here :

Rhabdophane-(Ce)

(Ce,La)PO4•(H2O)
Dana No: 40.04.07.01 Strunz No: 08.CJ.45
Locality:

Notes: