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Churchite-(Nd)

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

However, according to the paper by Podporina et al. (1983), this mineral 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.


Classification of Churchite-(Nd)

Discredited 2015
Explanation of status:
See general comment above.
8.CJ.50

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
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Physical Properties of Churchite-(Nd)

Vitreous
Colour:
Yellowish white
Streak:
White
Hardness (Mohs):
3 - 3½

Crystallography of Churchite-(Nd)

Crystal System:
Monoclinic

Chemical Properties of Churchite-(Nd)

Formula:
Nd(PO4) · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Churchite-(Nd) to other Species

8.CJ.05StercoriteNa(NH4)HPO4 · 4H2O
8.CJ.10Mundrabillaite(NH4)2Ca(HPO4)2 · H2O
8.CJ.10Swaknoite(NH4)2Ca(HPO4)2 · H2O
8.CJ.15NabaphiteNaBaPO4 · 9H2O
8.CJ.15NastrophiteNa(Sr,Ba)PO4 · 9H2O
8.CJ.20HaidingeriteCaHAsO4 · H2O
8.CJ.25VladimiriteCa4(AsO4)2(AsO3OH) · 4H2O
8.CJ.30FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2O
8.CJ.35Machatschkiite(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O
8.CJ.40PhaunouxiteCa3(AsO4)2 · 11H2O
8.CJ.40RauenthaliteCa3(AsO4)2 · 10H2O
8.CJ.45Brockite(Ca,Th,Ce)PO4 · H2O
8.CJ.45Grayite(Th,Pb,Ca)(PO4) · H2O
8.CJ.45Rhabdophane-(Ce)(Ce,La)(PO4) · H2O
8.CJ.45Rhabdophane-(La)(La,Ce)(PO4) · H2O
8.CJ.45Rhabdophane-(Nd)(Nd,Ce,La)(PO4) · H2O
8.CJ.45Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2O
8.CJ.45SmirnovskiteCaTh(PO4)2 · nH2O
8.CJ.50ArdealiteCa2(HPO4)(SO4) · 4H2O
8.CJ.50BrushiteCa(HPO4) · 2H2O
8.CJ.50Churchite-(Y)Y(PO4) · 2H2O
8.CJ.50PharmacoliteCa(HAsO4) · 2H2O
8.CJ.55McneariteNaCa5(AsO4)(HAsO4)4 · 4H2O
8.CJ.60DorfmaniteNa2HPO4 · 2H2O
8.CJ.65SincositeCa(VO)2(PO4)2 · 5H2O
8.CJ.65BariosincositeBa(VO)2(PO4)2 · 4H2O
8.CJ.70CatalanoiteNa2(HPO4) · 8H2O
8.CJ.75GuériniteCa5(AsO4)2(HAsO4)2 · 9H2O
8.CJ.85NingyoiteCaU(PO4)2 · 1-2H2O

Other Names for Churchite-(Nd)

Name in Other Languages:

Other Information

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)

Reference List:
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

http://www.mindat.org/mesg-7-12449.html

Internet Links for Churchite-(Nd)

Localities for Churchite-(Nd)

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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.
Mineral and/or Locality  
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