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Churchite-(Nd)

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Formula:
Nd(PO4) · 2H2O
Colour:
Yellowish white
Lustre:
Vitreous
Hardness:
3 - 3½
Crystal System:
Monoclinic
Name:
Named for Arthur Hubert Church (1834-1915), English chemist who described and analyzed the mineral.
A neodymium-rich churchite-(Y).

According to the paper by Podporina et al. (1983), the mineral named as churchite-(Nd) is only a Nd-rich variety of churchite-(Y). The Y content was not determined directly.

Walenta (1995) states in his description of churchite minerals from the Black Forest, Germany: "… Hier dürfte unter den Seltenen Erden Nd dominieren, was zur Bezeichnung Churchit-(Nd) führen würde."

The occurrence of Nd-dominant churchite reported from Italy (Bersani et al., 2011) is not confirmed. The specimen was subsequently characterized as rhabdophane-(Nd) (M.E. Ciriotti, pers.com., 2014).

No reliable quantitative chemical analyses of the above material is available.
Discredited by IMA nomenclature proposal 15-C, March 2015.




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Classification of Churchite-(Nd)Hide

Discredited
8.CJ.50

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

Physical Properties of Churchite-(Nd)Hide

Vitreous
Colour:
Yellowish white
Streak:
White
Hardness:
3 - 3½ on Mohs scale

Chemical Properties of Churchite-(Nd)Hide

Formula:
Nd(PO4) · 2H2O

Crystallography of Churchite-(Nd)Hide

Crystal System:
Monoclinic

Other Language Names for Churchite-(Nd)Hide

Related Minerals - Nickel-Strunz GroupingHide

8.CJ.CaesiumpharmacosideriteCsFe4[(AsO4)3(OH)4]·4H2OIso. 4 3m : P4 3m
8.CJ.05StercoriteNa(NH4)HPO4 · 4H2OTric.
8.CJ.10Mundrabillaite(NH4)2Ca(HPO4)2 · H2OMon. m : Pm
8.CJ.10Swaknoite(NH4)2Ca(HPO4)2 · H2OOrth.
8.CJ.15NabaphiteNaBaPO4 · 9H2OIso.
8.CJ.15NastrophiteNa(Sr,Ba)PO4 · 9H2O
8.CJ.20HaidingeriteCaHAsO4 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
8.CJ.25VladimiriteCa4(AsO4)2(AsO3OH) · 4H2OMon. 2/m : P21/b
8.CJ.30FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CJ.35Machatschkiite(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2OHex.
8.CJ.40PhaunouxiteCa3(AsO4)2 · 11H2OTric.
8.CJ.40RauenthaliteCa3(AsO4)2 · 10H2OTric. 1 : P1
8.CJ.45Brockite(Ca,Th,Ce)PO4 · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Grayite(Th,Pb,Ca)(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(Ce)Ce(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(La)La(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Rhabdophane-(Nd)Nd(PO4) · H2OHex. 6 2 2 : P62 2 2
8.CJ.45Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex.
8.CJ.45Smirnovskite(Th,Ca)PO4 · nH2OHex. 6 2 2 : P62 2 2
8.CJ.50ArdealiteCa2(HPO4)(SO4) · 4H2OMon. m : Bb
8.CJ.50BrushiteCa(HPO4) · 2H2OMon. m : Bb
8.CJ.50Churchite-(Y)Y(PO4) · 2H2OMon. 2/m : B2/b
8.CJ.50PharmacoliteCa(HAsO4) · 2H2OMon. m
8.CJ.55McneariteNaCa5(AsO4)(HAsO4)4 · 4H2OTric.
8.CJ.60DorfmaniteNa2HPO4 · 2H2OOrth.
8.CJ.65SincositeCa(VO)2(PO4)2 · 5H2OTet. 4/mmm (4/m 2/m 2/m) : P42/nnm
8.CJ.65BariosincositeBa(VO)2(PO4)2 · 4H2OTet.
8.CJ.70CatalanoiteNa2(HPO4) · 8H2OOrth. mmm (2/m 2/m 2/m) : Ibca
8.CJ.75GuériniteCa5(AsO4)2(HAsO4)2 · 9H2OMon. 2/m : P21/b
8.CJ.85NingyoiteCaU(PO4)2 · 1-2H2OOrth.

Other InformationHide

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

References for Churchite-(Nd)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Podporina, P. K., Burkov, V. V. & Danilova, K. N. (1983): Nd-churchites from the crust of weathering of Kazakhstan metamorphic rocks. Doklady Akad. Nauk SSSR 268, 195-198. [Engl. translation in Doklady Earth Sciences 268, 139-142 (1984); abstracts in Am. Mineral. 69, 211 (1984) and in Min. Abstracts 88M/1076.
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp.
Hikichi, Y. (1996): Preparation and some properties of rare earth orthophosphates. Kidorui, 29, 61-78. (in Japanese)
Assaaoudi, H.; Ennaciri, A.; Rulmont, A. (2001): Vibrational spectra of hydrated rare earth orthophosphates. Vibrational Spectroscopy 25, 81-90.
BERSANI DANILO, CADONI MARCELLA, BRACCO ROBERTO, BALESTRA CORRADO, CIRIOTTI MARCO E. (2011): CHURCHITE-(ND) FIRST WORLD OCCURRENCE FROM COSTA BALZI ROSSI, LIGURIA, ITALY: CHEMICAL DATA AND RAMAN SPECTROSCOPY. http://www.geoitalia.org/index.php?action=folder_list&lang=en&folder_id=310
Ciriotti, M. (2015) : Discreditation of the mineral species churchite-(Nd) and iodine. European Journal of Mineralogy. 27 (6): 813-819

Internet Links for Churchite-(Nd)Hide

Localities for Churchite-(Nd)Hide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Gengenbach
        • Haigerach valley
Wittern,A. (1995) Mineralien finden im Schwarzwald
Italy
 
  • Liguria
    • Savona Province
      • Maremola Valley
        • Magliolo
Bersani, D., Cadoni, M., Bracco, R., Balestra, C., Ciriotti, M. E. (2011): Churchite-(Nd) first world occurrence from Costa Balzi Rossi, Liguria, Italy: chemical data and Raman spectroscopy. Session J2, Panel n° 153. Geoitalia 2011, Turin.; Ciriotti, M. (2015) : Discreditation of the mineral species churchite-(Nd) and iodine. European Journal of Mineralogy. 27 (6): 813-819
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