Rhabdophane-(Ce) Mineral Data

Rhabdophane-(Ce) Mineral Data +

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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.

Synonym:

ICSD 31563

PDF 46-1303

Rhabdophane-(Ce) Image

Images:

Rhabdophane-(Ce)

Comments: White acicular crystals rhabdophane-(Ce) on matrix.
Location: Reinersreuth Quarry (K?hlerloch), Gro?er Waldstein, Wei?enstadt, 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),

Physical Properties of Rhabdophane-(Ce)

Cleavage:

None

Color:

White, Brownish white, Yellowish white, Pinkish white.

Density:

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Rhabdophane-(Ce)

Electron Density:

r_electron=3.63 gm/cc
note: r_{Rhabdophane-(Ce)}=4.00 gm/cc.

Fermion Index

Fermion Index = 0.00027
Boson Index = 0.99973

Photoelectric:

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

Radioactivity:

GRapi = 53,555.71 (Gamma Ray American Petroleum Institute Units)

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 Bequerols (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	1,238,849	3.35E-05	53,555.71	17.61
100 gm / 3.63 cm	123,885	3.35E-06	5,355.57	1.76
10 gm / 1.68 cm	12,388	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:

40.4.7.1 (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.29-10 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-(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 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - WWW-MINCRYST

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Rhabdophane-(Ce)

(Ce,La)PO4·(H2O)
Dana No: 40.4.7.1 Strunz No: VII/C.29-10
Locality:

Notes: