Rhabdophane-(Ce) (original) (raw)

A valid IMA mineral species

About Rhabdophane-(Ce)Hide

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Ce is almost always partly replaced by La, Nd and other REE.
Water content is given inconsistently in the literature (1H2O or 0.5H2O). Redetermination of the crystal structure, including a revision of the space group, gave 0.62(2)H2O (Kolitsch, 2021). Isostructural with BiPO4·0.67H2O (Romero et al., 1994).

Colour:

Brown, pale pink, yellowish-white; pale gray, fibers may be colourless in transmitted light.

Lustre:

Resinous, Waxy, Greasy, Dull

Specific Gravity:

3.77 - 4.01

Name:

Originally called simply rhabdophane and named in 1878 by William Garrow Lettsom from the Greek, ραβδοζ, a rod, plus φαιυεσθαι, to appear, in allusion to the bands characteristically exhibited in its spectrum. In 1966 the suffix/modifier was added to differentiate it from Nd dominant rhabdophane. The modifier "-(Ce)" indicates the predominance of cerium over other REE in this species.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3397:4

837898c2-cc50-491a-ad18-2a6a056f7069

IMA Classification of Rhabdophane-(Ce)Hide

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IMA status notes:

Renamed by the IMA

IMA Formula:

Ce(PO4) · H2O

Classification of Rhabdophane-(Ce)Hide

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8.CJ.45

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations

40.4.7.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O

19.9.6

19 : Phosphates
9 : Phosphates of rare earths and Sc

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of Rhabdophane-(Ce)Hide

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Resinous, Waxy, Greasy, Dull

Colour:

Brown, pale pink, yellowish-white; pale gray, fibers may be colourless in transmitted light.

Comment:

May be stained by iron oxides

Streak:

Colorless when pure

Fracture:

Irregular/Uneven, Sub-Conchoidal

Density:

3.77 - 4.01 g/cm3 (Measured) 4.19 g/cm3 (Calculated)

Optical Data of Rhabdophane-(Ce)Hide

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RI values:

_n_ω = 1.654 - 1.700 _n_ε = 1.703 - 1.744

δ = 0.049

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Optical Extinction:

Parallel

Comments:

Colorless, E tan to light brown

Chemistry of Rhabdophane-(Ce)Hide

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Mindat Formula:

Ce(PO4) · 0.6H2O

Ce is almost always partly replaced by La, Nd and other REE.
Water content is given inconsistently in the literature (1H2O or 0.5H2O). Redetermination of the crystal structure, including a revision of the space group, gave 0.62(2)H2O (Kolitsch, 2021). Isostructural with BiPO4·0.67H2O (Romero et al., 1994).

Crystallography of Rhabdophane-(Ce)Hide

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Class (H-M):

32 - Trapezohedral

Cell Parameters:

a = 7.037(1) Å, c = 6.429(1) Å

Unit Cell V:

275.71 ų (Calculated from Unit Cell)

Morphology:

Occurs as incrustations, botryoidal, globular, or stalactitic forms with radial-fibrous structure. Short rod-like simple hexagonal crystals.

Comment:

Space group and cell from Kolitsch (2021). Originally assumed to have space group P6222, with a = 7.07(2) and c = 19.06(5) Å.

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0009142	Rhabdophane-(Ce)	Mooney R C L (1950) X-ray diffraction study of cerous phosphate and related crystals I. Hexagonal modification Acta Crystallographica 3 337-340		1950	synthetic	0	293
0019169	Rhabdophane-(Ce)	Mooney R C L (1948) Crystal structures of a series of rare earth phosphates Journal of Chemical Physics 16 1003-1003	1948	synthetic	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Geological Setting:

An uncommon late-stage mineral in almost all of its occurrences: nepheline syenite pegmatites, polymetallic veins, also rarely from granite pegmatites, has been found in limonite beds

Type Occurrence of Rhabdophane-(Ce)Hide

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Place of Conservation of Type Material:

Muséum Nationale d’Histoire Naturelle, Paris, France, number 77.319 (type).

Geological Setting of Type Material:

Synonyms of Rhabdophane-(Ce)Hide

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Other Language Names for Rhabdophane-(Ce)Hide

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Varieties of Rhabdophane-(Ce)Hide

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Relationship of Rhabdophane-(Ce) to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Notes:

Readily soluble in HCl.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Rhabdophane-(Ce)Hide

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References for Rhabdophane-(Ce)Hide

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Reference List:

Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.

Romero, B., Bruque, S., Aranda, M.A.G., Iglesias, J.E. (1994): Syntheses, crystal structures, and characterization of bismuth phosphates. Inorganic Chemistry, 33, 1869-1874.

Localities for Rhabdophane-(Ce)Hide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.