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Churchite-(Dy)

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Formula:
(Dy,Sm,Gd,Nd)PO4 · 2H2O
Lustre:
Vitreous
Hardness:
3
Crystal System:
Monoclinic
Name:
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

Notes:
Published without approval
7/C.25-50

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

Vitreous
Hardness:

Chemical Properties of Churchite-(Dy)Hide

Formula:
(Dy,Sm,Gd,Nd)PO4 · 2H2O

Crystallography of Churchite-(Dy)Hide

Crystal System:
Monoclinic

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

ⓘ - 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
      • St Blasien
        • Menzenschwand
Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
Mineral and/or Locality  
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