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Churchite-(Nd)

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Formula:
Nd(PO
 
4
) · 2H
 
2
O
System:MonoclinicColour:Yellowish white
Lustre:VitreousHardness: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."

No reliable quantitative chemical analyses of the above material is available. A reinvestigation/reinterpretation is highly desirable.

The occurrence of Nd-dominant churchite reported from Italy (Bersani et al., 2011) is not confirmed at present (2012). An EBSD study is underway.

Classification of Churchite-(Nd)

IMA status:Renamed approved 1987
Explanation of status:See general comment above.
Strunz 8th edition ID:7/C.25-40
Nickel-Strunz 10th (pending) edition ID: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)

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

Crystallography of Churchite-(Nd)

Crystal System:Monoclinic

Chemical Properties of Churchite-(Nd)

Formula:
Nd(PO
 
4
) · 2H
 
2
O
Essential elements:H, Nd, O, P
All elements listed in formula:H, Nd, O, P

Relationship of Churchite-(Nd) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CJ.05Stercorite
Na(NH
 
4
)HPO
 
4
 · 4H
 
2
O
8.CJ.10Mundrabillaite
(NH
 
4
)
 
2
Ca(HPO
 
4
)
 
2
 · H
 
2
O
8.CJ.10Swaknoite
(NH
 
4
)
 
2
Ca(HPO
 
4
)
 
2
 · H
 
2
O
8.CJ.15Nabaphite
NaBaPO
 
4
 · 9H
 
2
O
8.CJ.15Nastrophite
Na(Sr,Ba)PO
 
4
 · 9H
 
2
O
8.CJ.20Haidingerite
CaHAsO
 
4
 · H
 
2
O
8.CJ.25Vladimirite
Ca
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH) · 4H
 
2
O
8.CJ.30Ferrarisite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 9H
 
2
O
8.CJ.35Machatschkiite
(Ca,Na)
 
6
(AsO
 
4
)(HAsO
 
4
)
 
3
(PO
 
4
,SO
 
4
) · 15H
 
2
O
8.CJ.40Phaunouxite
Ca
 
3
(AsO
 
4
)
 
2
 · 11H
 
2
O
8.CJ.40Rauenthalite
Ca
 
3
(AsO
 
4
)
 
2
 · 10H
 
2
O
8.CJ.45Brockite
(Ca,Th,Ce)PO
 
4
 · H
 
2
O
8.CJ.45Grayite
(Th,Pb,Ca)(PO
 
4
) · H
 
2
O
8.CJ.45Rhabdophane-(Ce)
(Ce,La)(PO
 
4
) · H
 
2
O
8.CJ.45Rhabdophane-(La)
(La,Ce)(PO
 
4
) · H
 
2
O
8.CJ.45Rhabdophane-(Nd)
(Nd,Ce,La)(PO
 
4
) · H
 
2
O
8.CJ.45Tristramite
(Ca,U,Fe)(PO
 
4
,SO
 
4
) · 2H
 
2
O
8.CJ.45UM1997-20-AsO:HU
U
4+
 
(HAsO
 
4
)
 
2
 · 4H
 
2
O
8.CJ.45Smirnovskite
CaTh(PO
 
4
)
 
2
 · nH
 
2
O
8.CJ.50Ardealite
Ca
 
2
(HPO
 
4
)(SO
 
4
) · 4H
 
2
O
8.CJ.50Brushite
Ca(HPO
 
4
) · 2H
 
2
O
8.CJ.50Churchite-(Y)
Y(PO
 
4
) · 2H
 
2
O
8.CJ.50Pharmacolite
Ca(HAsO
 
4
) · 2H
 
2
O
8.CJ.55Mcnearite
NaCa
 
5
(AsO
 
4
)(HAsO
 
4
)
 
4
 · 4H
 
2
O
8.CJ.60Dorfmanite
Na
 
2
HPO
 
4
 · 2H
 
2
O
8.CJ.65Sincosite
Ca(VO)
 
2
(PO
 
4
)
 
2
 · 5H
 
2
O
8.CJ.65Bariosincosite
Ba(VO)
 
2
(PO
 
4
)
 
2
 · 4H
 
2
O
8.CJ.70Catalanoite
Na
 
2
(HPO
 
4
) · 8H
 
2
O
8.CJ.75Guérinite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 9H
 
2
O
8.CJ.85Ningyoite
CaU(PO
 
4
)
 
2
 · 1-2H
 
2
O

Other Names for Churchite-(Nd)

Other Languages:
Russian:Черчит-(Nd)

Other Information

Health Warning: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


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    • Localities for Churchite-(Nd)

    Hide Locality List
    (TL) indicates type locality. ? 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.
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