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|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."
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)
|Hardness (Mohs):||3 - 3½|
Crystallography of Churchite-(Nd)
Chemical Properties of Churchite-(Nd)
|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):|
Other Names for Churchite-(Nd)
|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)
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
Internet Links for Churchite-(Nd)
Localities for Churchite-(Nd)
(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.
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