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(Dy,Sm,Gd,Nd)PO4 · 2H2O
Crystal System:
Named for Arthur Hubert Church (1834-1915), English chemist who described and analyzed the mineral.
Almost certainly misidentified churchite-(Y).

Walenta (1995) states in his description of churchite minerals from the Black Forest: "An Seltenen Erden sind Dy, Sm, Gd und Nd vertreten, Y ist dagegen nur in sehr geringen Mengen nachweisbar. Es ist also kein Churchit-(Y), sondern am ehesten ein Churchit-(Dy)". [The name was published without approval; no quantitative data were given.]

No modern quantitative chemical analyses of Walenta's (1995) sample are available, but a re-analysis of a "churchite-(Dy)" from Menzenschwand, Black Forest, clearly showed it to be a churchite-(Y) containing very minor Gd and Dy (Kolitsch & Brandstätter, unpubl. results, 2010).
In SEM-EDS spectra there might be a problem of overlap of the Dy L(alpha1+2) lines with the Fe K(alpha) line (the partial Y/P peak overlap is another serious problem for correct quantification - if the Y peaks have been recognised as such!).

Compare also the questionable Agardite-(Dy).

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Classification of Churchite-(Dy)Hide

Published without approval

7 : Phosphates, Arsenates, Vanadates
C : Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg
25 : Brushite - Churchite-(Dy) series

Physical Properties of Churchite-(Dy)Hide


Chemical Properties of Churchite-(Dy)Hide

(Dy,Sm,Gd,Nd)PO4 · 2H2O

Crystallography of Churchite-(Dy)Hide

Crystal System:

Other Language Names for Churchite-(Dy)Hide

Related Minerals - Nickel-Strunz Grouping (8th Edition)Hide

7/C.25-10BrushiteCa(HPO4) · 2H2OMon. m : Bb
7/C.25-20PharmacoliteCa(HAsO4) · 2H2OMon. m
7/C.25-30Churchite-(Y)Y(PO4) · 2H2OMon. 2/m : B2/b
7/C.25-40Churchite-(Nd)Nd(PO4) · 2H2OMon.

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-(Dy)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp.
Kolitsch & Brandstätter, unpubl. results, 2010

Internet Links for Churchite-(Dy)Hide

Localities for Churchite-(Dy)Hide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
  • Baden-Württemberg
    • Black Forest
      • St Blasien
        • Menzenschwand
Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
Mineral and/or Locality  
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